Okayama University

Takashi ASAHARA

日本語 English

Results

Awards icon Awards

JRC2025, The 4th International Conference on Radiological Physics and Technology (ICRPT), Certificate of Merit Award
Effective Atomic Number Score in Calcified Plaque Evaluation: Approach Using Photon-Counting CT
Takashi Asahara, Mana Ikegami, Natsumi Kimoto, Rina Nishigami, Yusuke Morimitsu, Noriaki Akagi, Mitsugi Honda, Toru Miyoshi, Hiroaki Hayashi, Toshihiro Iguchi
April, 2025
Department of Radiology Award, Okayama University Hospital
Takashi Asahara
April, 2025
Cyber DECT Conference DE-1 Grand Prix, Excellence Award
Identification of non-metallic dental materials using effective atomic number imaging with photon-counting CT
Takashi Asahara, Shunsuke Okada, Cheonghae Lee, Hiroaki Hayashi, Chihiro Kurose, Yusuke Morimitsu, Noriaki Akagi, Mitsugi Honda, Rina Nishigami, Daiku Kobayashi
June, 2024
The 80th Annual Meeting of the Japan Society of Radiological Technology (JSRT), Chairperson’s Recommendation Excellent Presentation Award
Discrimination of non-metal dental material using photon counting CT toward identifying human remains
Takashi Asahara, Shunsuke Okada, Chihiro Kurose, Hiroaki Hayashi, Rina Nishigami, Daiki Kobayashi, Sota Goto, Yusuke Morimitsu, Noriaki Akagi, Mitsugi Honda
May, 2024
JRC2023, The 2nd International Conference on Radiological Physics and Technology (ICRPT), Outstanding Presentation Award
A novel function for wearable dosimeters to determine both incident direction and absolute dose of X-rays during IVR procedure
Takashi Asahara, Hiroaki Hayashi, Tatsuya Maeda, Daiki Kobayashi, Sota Goto, Cheonghae Lee, Yuki Kanazawa, Naoki Maeda, Satoshi Imajo, Mitsugi Honda
April, 2023
The 75th Annual Meeting of the Japan Society of Radiological Technology (JSRT), Chairperson’s Recommendation Excellent Presentation Award
Actual Dose Measurement of Assistants while Positioning Patients during Pediatric X-ray Examination Using a Small-type Optically Stimulated Luminescence Dosimeter
Takashi Asahara, Hiroaki Hayashi, Yoshiki Mihara, Emi Tomita, Yuki Kanazawa, Kenji Yamada, Tohru Okazaki
April, 2019
The 45th Autumn Meeting of the Japan Society of Radiological Technology (JSRT), Chairperson’s Recommendation Excellent Presentation Award
Proposal of Accurate Calibration for Measuring Eye Lens Dose of the Operator during Transfemoral Cardiac Catheterization with Fluoroscopic System Using an OSL Dosimeter
Takashi Asahara, Hiroaki Hayashi, Emi Tomita, Sota Goto, Sumi Yokoyama, Yuki Kanazawa, Tohru Okazaki
June, 2018

Awards icon Awards (Collaborators, Students)

Japan Society of Radiological Technology (JSRT, JRC2025), CyPos Award (Bronze Prize)
Development of a real-time OSL dosimeter with minimal effect on CT imaging for direct measurement of patient dose [in Japanese]
Sota Goto, Takuya Kasue, Keiji Takahisa, Tatsuya Maeda, Kazuki Takegami, Takashi Asahara, Hiroaki Hayashi
April, 2025
The 20th Chugoku-Shikoku Forum on Radiological Technology (CSFRT2024), Student Excellent Presentation Award
Simulation study on the shielding ability of lead for protecting the eye lens of the eye of medical staff during Lu-177 radionuclide therapy [in Japanese]
Saya Inoue, Takashi Asahara, Toshihiro Iguchi, Daisuke Hasegawa, Keisuke Yoshitomi, Sota Goto
October, 2024
The 20th Chugoku-Shikoku Forum on Radiological Technology (CSFRT2024), Student Excellent Presentation Award
Evaluation of the conversion accuracy between CT values and electron density for dose calculation using photon-counting detector CT [in Japanese]
Moe Tsujimura, Takashi Asahara, Kazutaka Morishita, Yoshinori Tanabe, Toshihiro Ikuchi, Hideki Aoyama, Yuta Otsuka, Yuta Kawai, Mitsugi Honda, Kotaro Yoshio
October, 2024
The 80th Annual Meeting of the Japan Society of Radiological Technology (JSRT), Chairperson’s Recommendation Excellent Presentation Award
Convenient procedure to determine a dose reduction factor of the collar-type thyroid shield used for the chest CT examination
Kazuki Takegami, Hiroaki Hayashi, Tatsuya Maeda, Sota Goto, Takashi Asahara, Rina Nishigami, Daiki Kobayashi, Shuichi Murakami, Takeshi Konishi, Motochika Maki
May, 2024
The 80th Annual Meeting of the Japan Society of Radiological Technology (JSRT), Chairperson’s Recommendation Excellent Presentation Award
A novel analysis method to determine surface radiation dose taking into account the incident angle of X-rays during a helical scanning CT examination
Sota Goto, Hiroaki Hayashi, Tatsuya Maeda, Kazuki Takegami, Rina Nishigami, Daiki Kobayashi, Takashi Asahara, Yuki Kanazawa
May, 2024
The 80th Annual Meeting of the Japan Society of Radiological Technology (JSRT), Chairperson’s Recommendation Excellent Presentation Award
A novel evaluation procedure of X-ray shielding ability by estimating X-ray incident direction during helical CT examination
Tatsuya Maeda, Hiroaki Hayashi, Sota Goto, Kazuki Takegami, Takashi Asahara, Daiki Kobayashi, Rina Nishigami, Takeshi Konishi, Shuichi Murakami, Motochika Maki
May, 2024
ECR2024, European Congress of Radiology Scientific Exhibition Jury, Certificate of Merit Award
Direct dose measurement method during chest CT examination by taking into consideration the X-ray incident direction
Hiroaki HAYASHI, Tatsuya MAEDA, Sota GOTO, Kazuki TAKEGAMI, Takashi ASAHARA, Rina NISHIGAMI, Daiki KOBAYASHI, Yuki KANAZAWA, Kazuta YAMASHITA
February, 2024
SSD20, 20th international conference on solid state dosimetry, Best Poster Presentation Award
Exposure Dose Reduction in Medical X-ray Diagnostics for BMD Measurement
Tatsuya MAEDA, Hiroaki HAYASHI, Miku ANDO, Rina NISHIGAMI, Daiki KOBAYASHI, Cheonghae LEE, Takashi ASAHARA, Sota GOTO, Kazuki TAKEGAMI, Kazuta YAMASHITA, Kosaku HIGASHINO, Shuichi MURAKAMI, Takeshi KONISHI, Motochika MAKI
September, 2023
The 79th Annual Meeting of the Japan Society of Radiological Technology (JSRT), Chairperson’s Recommendation Excellent Research Presentation Award
Suitability of High-Tube-Voltage Imaging When Using Energy Resolving Photon Counting Detector (ERPCD): Simulation Study
Rina Nishigami, Hiroaki Hayashi, Cheonghae Lee, Daiki Kobayashi, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Tomonobu Haba, Natsumi Kimoto, Shuichiro Yamamoto
July, 2023
The 79th Annual Meeting of the Japan Society of Radiological Technology (JSRT), Chairperson’s Recommendation Excellent Research Presentation Award
Thyroid dose reduction related to the overranging effect by using a novel sponge-type shield during high-pitch chest CT examination
Kazuki Takegami, Hiroaki Hayashi, Tatsuya Maeda, Cheonghae Lee, Rina Nishigami, Takashi Asahara, Shuichi Murakami, Takeshi Konishi, Motochika Maki
July, 2023
Okayama University Hospital, “Kai-no-Ki” Award
CT/MRI Diagnostic Imaging and Surgical Support Analysis Team
December, 2020
The 76th Annual Meeting of the Japan Society of Radiological Technology (JSRT), Chairperson’s Recommendation Excellent Presentation Award
Phantom study using novel shaped OSL dosimeters having smaller angular dependence toward actual dose measurement during clinical X-ray examination
Sota Goto, Hiroaki Hayashi, Emi Tomita, Takashi Asahara, Kaho Ikushima, Momoka Kuwabara, Yuki Kanazawa, Natsumi Kimoto
July, 2020
The 76th Annual Meeting of the Japan Society of Radiological Technology (JSRT), Chairperson’s Recommendation Excellent Presentation Award
A Novel Algorithm for Material Identification Based on a Photon Counting Technique -Toward the Development of a Quantitative Plain X-ray Diagnosis Using an Effective Atomic Number Image-
Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Takashi Asahara, Akitoshi Katsumata, Shuichiro Yamamoto, Masahiro Okada
July, 2020
The 76th Annual Meeting of the Japan Society of Radiological Technology (JSRT), Excellent Student Award
Phantom study using novel shaped OSL dosimeters having smaller angular dependence toward actual dose measurement during clinical X-ray examination
Sota Goto, Hiroaki Hayashi, Emi Tomita, Takashi Asahara, Kaho Ikushima, Momoka Kuwabara, Yuki Kanazawa, Natsumi Kimoto
June, 2020
The 76th Annual Meeting of the Japan Society of Radiological Technology (JSRT), JSRT Bronze Award
A Novel Algorithm for Material Identification Based on a Photon Counting Technique -Toward the Development of a Quantitative Plain X-ray Diagnosis Using an Effective Atomic Number Image-
Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Takashi Asahara, Akitoshi Katsumata, Shuichiro Yamamoto, Masahiro Okada
June, 2020
RSNA2019, Education Exhibit Presentation Certificate of Merit Award
Photon counting technique: How to analyze a novel quantitative image?
Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Takashi Asahara, Tatsuya Maeda, Akitoshi Katsumata, Yuki Kanazawa, Shuji Koyama, Shuichiro Yamamoto, Masahiro Okada
December, 2019
The 74th Annual Meeting of the Japan Society of Radiological Technology (JSRT), CyPos Award (Silver Medal)
Rectum Dose Measurements Using Novel Dosimetric System During High-Dose-Rate 192Ir Brachytherapy Treatment of Cervical Cancer
Emi TOMITA, Hiroaki HAYASHI, Yasufumi SHITAKUBO, Kanako SAKURAGAWA, Yuki KANAZAWA, Hitoshi IKUSHIMA, Tohru OKAZAKI, Takashi ASAHARA, Takuya HASHIZUME, Yoshinori MIYAHARA
April, 2018

Grants icon Grants

JGC-Saneyoshi Scholarship Foundation, Research Grant (FY2025)
Development of quantitative chest imaging diagnostic methods using photon-counting CT
Principal Investigator: Takashi Asahara
Co-Investigators: Hiroaki Hayashi, Toshihiro Iguchi, Natsumi Kimoto
September 2025–August 2027
Japan Society for the Promotion of Science (JSPS), Grants-in-Aid for Scientific Research (KAKENHI, Early-Career Scientists, 25K21586)
Translational Development of Photon-Counting CT-Based Material Decomposition for Cardiovascular Medicine
Principal Investigator: Takashi Asahara
April 2025–March 2027
Hitachi Global Foundation, 56th Kurata Research Grant (FY2024)
Application of Composition Analysis Technology Using Photon-Counting CT in the Field of Cardiovascular Medicine
Principal Investigator: Takashi Asahara
Co-Investigators: Hiroaki Hayashi, Natsumi Kimoto
March, 2025
Cardiovascular Research Fund
Evaluation for coronary artery plaques using quantitative images generated by photon-counting CT
Principal Investigator: Takashi Asahara
Co-Investigators: Hiroaki Hayashi, Toshihiro Iguchi
April, 2025
Okayama Association of Radiological Technologists, Research Grant (FY2024)
Applied research on photon-counting CT for forensic odontology using effective atomic number imaging
Principal Investigator: Takashi Asahara
Co-Investigators: Hiroaki Hayashi, Shunsuke Okada
September, 2024
Teraoka Scholarship Foundation, Research Grant
Development of a novel method for coronary plaque calcification analysis using state-of-the-art CT scanners
Principal Investigator: Takashi Asahara
Co-Investigators: Hiroaki Hayashi, Sota Goto
August, 2024
Japan Society for the Promotion of Science (JSPS), Grants-in-Aid for Scientific Research (KAKENHI, Research Activity Start-up, 24K23055)
Study on forensic odontology applications of photon-counting CT enabling quantitative analysis of X-ray
Principal Investigator: Takashi Asahara
July, 2024
20th International Conference on Solid State Dosimetry (SSD20), student early fees
An active-type personal dosimeter having functions to derive both incident direction and absolute dose of scattered X-rays during clinical X-ray examinations
Takashi ASAHARA, Hiroaki HAYASHI, Tatsuya MAEDA, Daiki KOBAYASHI, Sota GOTO, Rina NISHIGAMI, Miku ANDO, Cheonghae LEE, Yuki KANAZAWA, Kazuta YAMASHITA, Naoki MAEDA, Satoshi IMAJO, Mitsugi HONDA
September, 2023
Kanazawa University Study Abroad Scholarship (SSD20)
An active-type personal dosimeter having functions to derive both incident direction and absolute dose of scattered X-rays during clinical X-ray examinations
Takashi Asahara
September, 2023
European Congress of Radiology (ECR), Invest in the Youth programme
A wearable active-type dosimeter having novel functions to derive both incident direction and absolute dose of scattered X-rays during IVR procedures
Takashi Asahara
March, 2023
Kanazawa University Study Abroad Scholarship, Graduate School Research Exchange Program (FY2019, Dispatch): RSNA2019
Photon counting technique: How to analyze a novel quantitative image? (Co-presenter)
Takashi Asahara
November, 2019
SSD19, Award for reduced conference fee & Marko Moscovitch School fee
Precise dose calibration method of OSL dosimeter with help of X-ray spectra toward exposure dose evaluation of eye lens
Takashi Asahara
September, 2019
European Congress of Radiology (ECR), Invest in the Youth programme
Actual dose measurements of assistant during pediatric X-ray examination with a precisely calibrated optically stimulated luminescence dosimeter
Takashi Asahara
March, 2019
European Congress of Radiology (ECR), Invest in the Youth programme
Phantom study toward accurate measurement of eye lens dose exposure of operator during transfemoral cardiac catheterization using fluoroscopy examination with an OSL dosimeter
Takashi Asahara
March, 2018

Grants icon Grants(Collaborators)

Ryobi Teien Memorial Foundation, Research Grant (FY2025, 47th Award)
Development of a novel diagnostic strategy for ground-glass lung cancer using quantitative imaging technology
Principal Investigator: Toshihiro Iguchi
Co-Investigators: Takashi Asahara, Fumiyo Higaki, Hiroaki Hayashi
October 2025–September 2026
Okayama Health Foundation, Cancer Research Grant (FY2025)
Establishment of an ultra-low-dose lung cancer screening method using photon-counting CT with quantitative imaging
Principal Investigator: Toshihiro Iguchi
Co-Investigators: Takashi Asahara, Fumiyo Higaki, Hiroaki Hayashi
September 2025–September 2026
Wesco Science Promotion Foundation, Research Grant (FY2025)
Development of novel diagnostic strategies for abdominal organ tumors using quantitative imaging techniques in non-contrast CT
Principal Investigator: Toshihiro Iguchi
Co-Investigators: Takashi Asahara, Fumiyo Higaki, Hiroaki Hayashi
June 2025–March 2026
Meditech Japan Co., Ltd., Collaborative Research
Principal Investigator: Hiroaki Hayashi
Co-Investigators: Takashi Asahara, Sota Goto, Kazuki Takegami, Takeshi Konishi, Shoichi Tanizaki, Yutaka Tanaka, Shinichi Morimoto
April 2025–February 2026
JOB Co., Ltd., Collaborative Research
Principal Investigator: Hiroaki Hayashi
Co-Investigators: Daiki Kobayashi, Rina Nishigami, Takashi Asahara, Natsumi Kimoto, Shuichiro Yamamoto, Daisuke Hashimoto, Hideaki Tanaka, Masahiro Okada, Fumio Tsuchiya, Masashi Yamasaki, Koichi Yoshinari, Yasuhiro Kuramoto
April 2025–February 2026
Japan Society for the Promotion of Science (JSPS), Grants-in-Aid for Scientific Research (KAKENHI, Scientific Research (B), 24K03306)
Development of quantitative analysis technology for objects using photon-counting X-ray radiography and derivation of quantitative indicators of bone strength
Principal Investigator: Hiroaki Hayashi
Co-Investigators: Yuki Kanazawa, Tomonobu Haba, Sota Goto, Tatsuya Maeda, Natsumi Kimoto, Takashi Asahara, Kazuta Yamashita, Akitoshi Katsumata, Shunsuke Okada, Shigeki Kobayashi
April, 2024
Meditech Japan Co., Ltd., Collaborative Research
Principal Investigator: Hiroaki Hayashi
Co-Investigators: Takeshi Konishi, Shuichi Murakami, Yutaka Tanaka, Shinichi Morimoto
Collaborators: Tatsuya Maeda, Sara Tonami, Takashi Asahara
March 2024–February 2025
Suzuki Kenzo Memorial Foundation, Research Grant (FY2023)
Forensic applications of effective atomic number imaging generated by state-of-the-art CT scanners
Principal Investigator: Hiroaki Hayashi
Co-Investigators: Shunsuke Okada, Takashi Asahara, Sota Goto
December 2023–December 2024
Meditech Japan Co., Ltd., Collaborative Research
Principal Investigator: Hiroaki Hayashi
Co-Investigators: Takeshi Konishi, Shuichi Murakami, Yutaka Tanaka
Collaborators: Tatsuya Maeda, Takashi Asahara, Shinichi Morimoto
February 2023–February 2024
Terumo Life Science Foundation, Research Grant (FY2019)
Development of a real-time dosimeter to promote radiation exposure dose reduction for medical staff
Principal Investigator: Hiroaki Hayashi
Co-Investigators: Takashi Asahara, Tatsuya Maeda, Kazuta Yamashita
January 2020–December 2020

Books icon Books

Impact of blurring correction method in quantitative image analysis using energy-resolving photon counting detector (ERPCD)
Hiroshi HAYASHI, Daiki KOBAYASHI, Rina NISHIGAMI, Natsumi KIMOTO, Tatsuya MAEDA, Takashi ASAHARA
CdTe and CdZnTe Materials: Material Properties and Applications (edited by Krzysztof Iniewski), 2024
ISBN:978-3-031-64520-4
Purchase on Springer
Physics of Medical X-rays (Special Feature: Occupational Exposure of Orthopedic Surgeons)
Hiroaki Hayashi, Natsumi Kimoto, Takashi Asahara, Cheonghae Lee, Takumi Asakawa, Tatsuya Maeda
Orthopaedics and traumatology(Japanese edition), Vol. 64, No. 6, 735-744, 2021
ISBN:9784003306406
Photon Counting Detectors for X-ray Imaging: Physics and Applications
Hiroshi HAYASHI, Natsumi KIMOTO, Takashi ASAHARA, Takumi ASAKAWA, Cheonghee LEE, Akitoshi KATSUMATA
Springer, 2021
ISBN:978-3-030-78079-2
Purchase on Springer

Patent icon Patent

Method for evaluating performance of radiation shield used for CT Imaging
Hiroaki Hayashi, Tatsuya Maeda, Takashi Asahara, Daiki Kobayashi, Rina Nishigami, Kazuki Takegami, Sota Goto, Motochika Maki, Takeshi Konishi, Shuichi Murakami, Shinichi Morimoto
Japanese Patent Application No. 2024-000808 (2024)
SYSTEM THAT ANALYZES MEASURED VALUE OF EXPOSURE DOSE IN X-RAY CT INSPECTION BY EMPLOYING CT IMAGE
Hiroaki Hayashi, Kazuki Takegami, Tatsuya Maeda, Takashi Asahara, Sota Goto, Rina Nishigami, Daiki Kobayashi
Domestic priority application (based on Japanese Patent Application No. 2023-043229, revised):
Japanese Patent Application No. 2023-111491 (2023)
SYSTEM THAT ANALYZES MEASURED VALUE OF EXPOSURE DOSE IN X-RAY CT INSPECTION BY EMPLOYING CT IMAGE
Hiroaki Hayashi, Kazuki Takegami, Tatsuya Maeda, Takashi Asahara, Sota Goto
Japanese Patent Application No. 2023-043229 (2023)
RADIATION MEASUREMENT SYSTEM
Hiroaki Hayashi, Takashi Asahara, Tatsuya Maeda, Daiki Kobayashi
Japanese Patent Application No. 2022-123220;
Japanese Unexamined Patent Application Publication No. 2024-020779 (2022)
RADIATION DOSIMETER
Hiroaki Hayashi, Takashi Asahara, Tatsuya Maeda
Japanese Patent Application No. 2019-195607;
Japanese Unexamined Patent Application Publication No. 2021-067650 (2019)

Papers icon Papers

Helical X-ray Tube Trajectory Estimation via Image Noise Analysis for Enhanced CT Dosimetry
Tatsuya Maeda, Kazuki Takegami, Sota Goto, Takashi Asahara, Daiki Kobayashi, Rina Nishigami, Natsumi Kimoto, Kazuta Yamashita, Kosaku Higashino, Shinichi Morimoto, Takeshi Konishi, Motochika Maki, Hiroaki Hayashi
Radiation Physics and Chemistry, 239, 113260, 2026.
DOI: 10.1016/j.radphyschem.2025.113260
Applicability of effective atomic number (Zeff) image analysis of coronary plaques measured with photon counting computed tomography
Takashi Asahara, Mana Mitani, Natsumi Kimoto, Rina Nishigami, Kazuki Takegami, Yusuke Morimitsu, Noriaki Akagi, Toru Miyoshi, Yuki Kanazawa, Toshihiro Iguchi, Hiroaki Hayashi
Investigative Radiology, Published Ahead-of-print, 2025.
DOI: 10.1097/RLI.0000000000001237
Bone-enhanced high contrast X-ray images derived from attenuation estimation related to ultra-low energy X-rays – An application of an energy-resolving photon-counting detector (ERPCD) –
Rina Nishigami, Natsumi Kimoto, Takashi Asahara, Tatsuya Maeda, Daiki Kobayashi, Sota Goto, Tomonobu Haba, Yuki Kanazawa, Shuichiro Yamamoto, Hiroaki Hayashi
Radiation Physics and Chemistry, 238, 113243, 2026.
DOI: 10.1016/j.radphyschem.2025.113243
Counting-loss correction procedure of X-ray imaging detectors with consideration for the effective atomic number of biological objects
Natsumi Kimoto, Rina Nishigami, Daiki Kobayashi, Tatsuya Maeda, Takashi Asahara, Sota Goto, Yuki Kanazawa, Akitoshi Katsumata, Shuichiro Yamamoto, Hiroaki Hayashi
Radiation Physics and Chemistry, 239, 113237, 2026.
DOI: 10.1016/j.radphyschem.2025.113237
Impact of pre-reconstruction filtering with butterworth filter on 111In-pentetreotide SPECT image quality and quantitative accuracy: A phantom study
Daisuke Hasegawa, Toshihiro Iguchi, Masahiro Nakashima, Keisuke Yoshitomi, Masahiro Miyai, Katsuhide Kojima, Takashi Asahara
Radiography, 31(6), 103121, 2025.
DOI: 10.1016/j.radi.2025.103121
Impact of different X-ray tube positions on actual dose measurements during CT examinations -An effect of patient physique-
Hiroaki Hayashi, Tatsuya Maeda, Kazuki Takegami, Sota Goto, Takashi Asahara, Natsumi Kimoto, Rina Nishigami, Daiki Kobayashi, Yuki Kanazawa, Kazuta Yamashita, Takeshi Konishi, Motochika Maki
Radiation Physics and Chemistry, 237, 113001, 2025.
DOI: 10.1016/j.radphyschem.2025.113001
Effectiveness of radiation protectors to reduce occupational radiation dose of medical staff when performing radioligand therapy with 177Lu
Saya Inoue, Takashi Asahara, Daisuke Hasegawa, Keisuke Yoshitomi, Sota Goto, Hiroaki Hayashi, Toshihiro Iguchi
Radiation Physics and Chemistry, 235, 112808, 2025.
DOI: 10.1016/j.radphyschem.2025.112808
A novel analytic procedure for accurate patient surface dose measurement during computed tomography examination: systematic uncertainty correction related to incident X-ray direction
Sota Goto, Tatsuya Maeda, Kazuki Takegami, Rina Nishigami, Daiki Kobayashi, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Kazuta Yamashita, Kosaku Higashino, Takeshi Konishi, Motochika Maki, Hiroaki Hayashi
Radiation Physics and Chemistry, 230, 112551, 2025.
DOI: 10.1016/j.radphyschem.2025.112551
Optimization of energy windows to calculate quantitative X-ray images using an energy-resolving photon-counting detector: A simulation study
Rina Nishigami, Daiki Kobayashi, Natsumi Kimoto, Takashi Asahara, Tatsuya Maeda, Tomonobu Haba, Yuki Kanazawa, Shuichiro Yamamoto, Hiroaki Hayashi
Radiation Physics and Chemistry, 229, 112460, 2025.
DOI: 10.1016/j.radphyschem.2024.112460
Helpfulness of effective atomic number image in forensic dental identification: photon-counting computed tomography is suitable
Takashi Asahara, Shunsuke Okada, Hiroaki Hayashi, Tatsuya Maeda, Rina Nishigami, Daiki Kobayashi, Chihiro Kurose, Natsumi Kimoto, Sota Goto, Miki Hisatomi, Yoshinobu Yanagi, Toshihiro Iguchi
Computers in Biology and Medicine, 184, 109333, 2025.
DOI: 10.1016/j.compbiomed.2024.109333
Computed tomography findings of idiopathic multicentric Castleman disease subtypes
Toshihiro Iguchi, Asami Nishikori, Yasuharu Sato, Midori Filiz Nishimura, Noriko Iwaki, Katsuhide Kojima, Takashi Asahara, Fumio Otsuka, Yoshinobu Maeda, Takao Hiraki
Journal of Clinical and Experimental Hematopathology, 64(4), 292-296, 2024.
DOI: 10.3960/jslrt.24053
A suitable procedure of dose reduction factor measurements of X-ray shields during computed tomography examination - the importance of considering positional changes of an X-ray tube -
Hiroaki Hayashi, Tatsuya Maeda, Kazuki Takegami, Rina Nishigami, Daiki Kobayashi, Takashi Asahara, Sota Goto, Natsumi Kimoto, Yuki Kanazawa, Kazuta Yamashita, Kosaku Higashino, Shuichi Murakami, Takeshi Konishi, Motochika Maki
Radiation Physics and Chemistry, 222, 111880, 2024.
DOI: 10.1016/j.radphyschem.2024.111880
Effectiveness of an X-ray shielding sheet with lower shielding ability to enable both bone mineral density determination and morphological diagnosis
Tatsuya Maeda, Hiroaki Hayashi, Miku Ando, Rina Nishigami, Daiki Kobayashi, Takashi Asahara, Sota Goto, Natsumi Kimoto, Kazuki Takegami, Kazuta Yamashita, Kosaku Higashino, Shuichi Murakami, Takeshi Konishi, Motochika Maki
Radiation Measurements, 176, 107219, 2024.
DOI: 10.1016/j.radmeas.2024.107219
Evaluation of lower detection limit and performance analyses related to the incident angle of X-rays and absolute dose using a triple-type dosimeter
Takashi Asahara, Hiroaki Hayashi, Tatsuya Maeda, Daiki Kobayashi, Rina Nishigami, Sota Goto, Miku Ando, Natsumi Kimoto, Yuki Kanazawa, Kazuta Yamashita
Radiation Measurements, 175, 107148, 2024.
DOI: 10.1016/j.radmeas.2024.107148
A blurring correction method suitable to analyze quantitative x-ray images derived from energy-resolving photon counting detector
Daiki Kobayashi, Hiroaki Hayashi, Rina Nishigami, Tastuya Maeda, Takashi Asahara, Yuki Kanazawa, Akitoshi Katsumata, Natsumi Kimoto, Shuichiro Yamamoto
Physics in Medicine & Biology, 69, 075023, 2024.
DOI: 10.1088/1361-6560/ad3119
Performance of elastic x-ray shield made by embedding Bi2O3 particles in porous polyurethane
Tatsuya Maeda, Hiroaki Hayashi, Miku Ando, Daiki Kobayashi, Rina Nishigami, Takashi Asahara, Sota Goto, Cheonghae Lee, Kazuta Yamashita, Kosaku Higashino, Takeshi Konishi, Shuichi Murakami, Motochika Maki
Medical Physics, 51, 2, 2023.
DOI: 10.1002/mp.16889
A wearable active-type X-ray dosimeter having novel functions to derive both incident direction and absolute exposure dose
Takashi Asahara, Hiroaki Hayashi, Tatsuya Maeda, Sota Goto, Daiki Kobayashi, Rina Nishigami, Cheonghae Lee, Miku Ando, Yuki Kanazawa, Satoshi Imajo, Kazuta Yamashita, Kosaku Higashino
Radiation Physics and Chemistry, 208, 110932, 2023.
DOI: 10.1016/j.radphyschem.2023.110932
Thyroid dose reduction shield with the generation of less artifacts used for fast chest CT examination
Kazuki Takegami, Hiroaki Hayashi, Tatsuya Maeda, Cheonghae Lee, Rina Nishigami, Takashi Asahara, Sota Goto, Daiki Kobayashi, Miku Ando, Yuki Kanazawa, Kazuta Yamashita, Kosaku Higashino, Shuichi Murakami, Takeshi Konishi, Motochika Maki
Radiation Physics and Chemistry, 203, 110635, 2023.
DOI: 10.1016/j.radphyschem.2022.110635
A disposable OSL dosimeter for in vivo measurement of rectum dose during brachytherapy
Hiroaki Hayashi, Natsumi Kimoto, Tatsuya Maeda, Emi Tomita, Takashi Asahara, Sota Goto, Yuki Kanazawa, Yasufumi Shitakubo, Kanako Sakuragawa, Hitoshi Ikushima, Tohru Okazaki, Takuya Hashizume
Medical Physics, 48, 8, 4621– 4635, 2021.
DOI: 10.1002/mp.14857
Effective atomic number image determination with an energy-resolving photon-counting detector using polychromatic X-ray attenuation by correcting for the beam hardening effect and detector response
Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Cheonghae Lee, Takashi Asahara, Tatsuya Maeda, Sota Goto, Yuki Kanazawa, Akitoshi Katsumata, Shuichiro Yamamoto, Masahiro Okada
Applied Radiation and Isotopes, 170, 109617, 2021.
DOI: 10.1016/j.apradiso.2021.109617
Evaluation of calibration factor of OSLD toward eye lens exposure dose measurement of medical staff during IVR
Takashi Asahara, Hiroaki Hayashi, Sota Goto, Natsumi Kimoto, Kazuki Takegami, Tatsuya Maeda, Yuki Kanazawa, Tohru Okazaki, Takuya Hashizume
Journal of Applied Clinical Medical Physics, 21, 11, 263– 271, 2020.
DOI: 10.1002/acm2.13042
An idea to reduce angular dependence of dosimeter having a disk-shaped detection region
Sota Goto, Hiroaki Hayashi, Emi Tomita, Takashi Asahara, Natsumi Kimoto, Kazuki Takegami, Takumi Asakawa, Yuki Kanazawa, Tohru Okazaki, Takuya Hashizume
Radiation Measurements, 137, 106323, 2020.
DOI: 10.1016/j.radmeas.2020.106323
Applicability of a Practical Calibration for the Small-type OSL Dosimeter for Measuring Doses from Direct X-rays and Penetrating X-rays Affected by Scattered Radiation
Tohru Okazaki, Hiroaki Hayashi, Yoshiki Mihara, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Kosaku Higashino, Kazuta Yamashita, Sumi Yokoyama, Kazuki Takegami, Takuya Hashizume, Vergil Le Cruz, Ikuo Kobayashi
Progress in Nuclear Science and Technology, 6, pp.22-25, 2019.
DOI: 10.15669/pnst.6.22
Development of Novel Rectum Dosimeter using OSL sheet with the aim of Direct Dose Measurement of Organ Dose during Brachytherapy
Takashi Asahara, Hiroaki Hayashi, Emi Tomita, Kanako Sakuragawa, Hiroshi Saegusa, Yasufumi Shitakubo, Hitoshi Ikushima, Yuki Kanazawa, Yoshiki Mihara, Yoshinori Miyahara, Tohru Okazaki, Takuya Hashizume, Vergil Le Cruz
Progress in Nuclear Science and Technology, 6, pp.30-33, 2019.
DOI: 10.15669/pnst.6.30
Direct Dose Measurement of Patients during Pediatric Computed Tomography Examination
Hiroaki Hayashi, Emi Tomita, Sota Goto, Natsumi Kimoto, Keiji Tada, Ryosuke Kasai, Yuki Kanazawa, Yoshiki Mihara, Takashi Asahara, Tohru Okazaki, Takuya Hashizume, Vergil Le Cruz
Progress in Nuclear Science and Technology, 6, pp.18-21, 2019.
DOI: 10.15669/pnst.6.18
Energy and Angular Dependence of the Small-Type OSL Dosimeter in Nuclear Medicine Regions using Monte Carlo Simulation
Vergil Le Cruz, Tohru Okazaki, Hiroaki Hayashi, Yoshiki Mihara, Takashi Asahara, Natsumi Kimoto, Hiroki Okino, Yuki Kanazawa, Takuya Hashizume, Ikuo Kobayashi
Progress in Nuclear Science and Technology, 6, pp.34-38, 2019.
DOI: 10.15669/pnst.6.34
Direct Radiation Dose Measurement of Rectum during High-Dose-Rate 192Ir Brachytherapy for Cervical Cancer Treatment
Emi Tomita, Hiroaki Hayashi, Takashi Asahara, Kanako Sakuragawa, Yasufumi Shitakubo, Hiroshi Saegusa, Hitoshi Ikushima, Yuki Kanazawa, Sota Goto, Tohru Okazaki, Takuya Hashizume, Vergil Le Cruz
Progress in Nuclear Science and Technology, 6, pp.39-42, 2019.
DOI: 10.15669/pnst.6.39
Exposure dose measurement during diagnostic pediatric X-ray examination using an optically stimulated luminescence (OSL) dosimeter based on precise dose calibration taking into consideration variation of X-ray spectra
Takashi Asahara, Hiroaki Hayashi, Sota Goto, Emi Tomita, Natsumi Kimoto, Yoshiki Mihara, Takumi Asakawa, Yuki Kanazawa, Akitoshi Katsumata, Kosaku Higashino, Kazuta Yamashita, Tohru Okazaki, Takuya Hashizume
Radiation Measurements, 119, 209–219, 2018.
DOI: 10.1016/j.radmeas.2018.10.007
Precise material identification method based on a photon counting technique with correction of the beam hardening effect in X-ray spectra
Natsumi Kimoto, Hiroaki Hayashi, Takashi Asahara, Yoshiki Mihara, Yuki Kanazawa, Tsutomu Yamakawa, Shuichiro Yamamoto, Masashi Yamasaki, Masahiro Okada
Applied Radiation and Isotopes, 124, 16-26, 2017.
DOI: 10.1016/j.apradiso.2017.01.049

Papers icon Proceedings

Applicability of high tube voltage imaging to achieve accurate quantitative images when applying photon counting detectors to general radiography
Rina Nishigami, Hiroaki Hayashi, Daiki Kobayashi, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Natsumi Kimoto, Shuichiro Yamamoto
Proceedings of SPIE, 2024
Direct dose measurement method during chest CT examination by taking into consideration the X-ray incident direction
Hiroaki Hayashi, Tatsuya Maeda, Sota Goto, Kazuki Takegami, Takashi Asahara, Rina Nishigami, Daiki Kobayashi, Yuki Kanazawa, Kazuta Yamashita
European Congress of Radiology, EPOS, C-11117, 2024
Simulation study on functional images to optimize radiographic condition using energy resolving photon counting detector
Rina Nishigami, Hiroaki Hayashi, Daiki Kobayashi, Cheonghae Lee, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Natsumi Kimoto, Shuichiro Yamamoto
Proceedings of IEEE, 2023
Automatic determination algorithm of intrinsic parameters on response function of energy-resolving photon counting imaging detector
Cheonghae Lee, Hiroaki Hayashi, Daiki Kobayashi, Rina Nishigami, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Akitoshi Katsumata, Natsumi Kimoto, Shuichiro Yamamoto
Proceedings of IEEE, 2023
A wearable active-type dosimeter having novel functions to derive both incident direction and absolute dose of scattered X-rays during IVR procedures
Takashi Asahara, Hiroaki Hayashi, Tatsuya Maeda, Sota Goto, Daiki Kobayashi, Cheonghae Lee, Yuki Kanazawa, Naoki Maeda, Mitsugi Honda
EPOS, ECR 2023, C-10352, 2023
Practical procedure to reduce thyroid dose related to the overranging effect during fast chest CT examination using a novel sponge shield with embedded fine bismuth particles
Kazuki Takegami, Hiroaki Hayashi, Tatsuya Maeda, Cheonghae Lee, Rina Nishigami, Takashi Asahara, Shuichi Murakami, Takeshi Konishi, Motochika Maki
EPOS, ECR 2023, C-14810, 2023
Dose calibration factor of an OSL dosimeter during CT examination to measure exposure dose of patients taking into consideration proper X-ray quality
Kazuki Takegami, Hiroaki Hayashi, Takashi Asahara, Sota Goto, Emi Tomita, Natsumi Kimoto, Yuki Kanazawa, Shohei Kudomi
European Congress of Radiology (EPOS), 2020
Feasibility study of photon counting detector for producing effective atomic number image
Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Takashi Asahara, Tatsuya Maeda, Yuki Kanazawa, Akitoshi Katsumata, Shuichiro Yamamoto, Masahiro Okada
Proceedings of IEEE(MIC), 4 pages, 2019
Importance of considering the response function of photon counting detectors with the goal of precise material identification
Takumi Asakawa, Hiroaki Hayashi, Natsumi Kimoto, Takashi Asahara, Tatsuya Maeda, Shuji Koyama, Shuichiro Yamamoto, Masahiro Okada
Proceedings of IEEE(MIC), 8 pages, 2019
Determining the difference of calibration factors in diagnostic X-rays and mono-energetic X-rays of the small type OSL dosimeter for a more precise dose evaluation in diagnostic X-ray examinations
Tohru Okazaki, Hiroki Hayashi, Sota Goto, Takashi Asahara, Emi Tomita, Yuki Kanazawa, Takuya Hashizume, Vergil Cruz, W. H. Cheng
European Congress of Radiology (EPOS), C-0212, 14pages, 2019
Reproduction of response functions of a multi-pixel-type energy-resolved photon counting detector while taking into consideration interaction of X-rays, charge sharing and energy resolution
Natsumi Kimoto, Hiroaki Hayashi, Takashi Asahara, Emi Tomita, Sota Goto, Yuki Kanazawa, Shuichiro Yamamoto, Masahiro Okada, Masashi Yamasaki
Proceedings of IEEE(MIC), 4 pages, 2018
Phantom study using an OSL dosimeter with the aim of accurate measurement of eye lens dose exposure of operator during transfemoral cardiac catheterization using fluoroscopic examination
Takashi Asahara, Hiroaki Hayashi, Emi Tomita, Sota Goto, Natsumi Kimoto, Kenji Yamada, Sumi Yokoyama, Yuki Kanazawa, Tohru Okazaki
European Congress of Radiology, EPOS C-0044, 34 pages, 2018
Novel material identification method using three energy bins of a photon counting detector taking into consideration Z-dependent beam hardening effect correction with the aim of producing an X-ray image with information of effective atomic number
Kimoto Natsumi, Hayashi Hiroaki, Asahara Takashi, Tomita Emi, Goto Sota, Mihara Yoshiki, Yuki Kanazawa, Yamakawa Tsutomu, Yamamoto Shuichiro, Yamasaki Masashi, Okada Masahiro and Hashimoto Daisuke
2017 IEEE Nuclear Science Symposium; Medical Imaging Conference, Conference Record (4 pages), 2017
Preliminary study for exposure dose measurement of people assisting during a pediatric X-ray procedure by means of a small-type OSL dosimeter
Hiroaki Hayashi, Yoshiki Mihara, Natsumi Kimoto, Takashi Asahara, Kenji Yamada, Yuki Kanazawa, Masafumi Harada, Tohru Okazaki, Takuya Hashizume
European Congress of Radiology, pp.C-0034-1--C-0034-19, 2017
Development of a novel method based on a photon counting technique with the aim of precise material identification in clinical X-ray diagnosis
Natsumi Kimoto, Hiroaki Hayashi, Asahara Takashi, Yuki Kanazawa, Yamakawa Tsutomu, Yamamoto Shuichiro, Yamasaki Masashi, Okada Masahiro
Proceedings of SPIE, 2017
Response functions of multi-pixel-type CdTe detector, --- Toward development of precise material identification on diagnostic X-ray images by means of photon counting ---
Hiroaki Hayashi, Asahara Takashi, Kimoto Natsumi, Yuki Kanazawa, Yamakawa Tsutomu, Yamamoto Shuichiro, Yamasaki Masashi, Okada Masahiro
Proceedings of SPIE, 2017

International Conference icon International Conference

X-ray dose determination of medical staff during fluoroscopic examination: A novel wearable dosimeter system that can analyze incident direction of radiation
Takashi Asahara, Tatsuya Maeda, Rina Nishigami, Daiki Kobayashi, Sota Goto, Natsumi Kimoto, Kazuki Takegami, Mitsugi Honda, Toshihiro Iguchi, Hiroaki Hayashi
21st International Conference on Solid State Dosimetry (SSD21), June, 2025
Development of active-type OSL dosimeter for measuring patient surface dose during CT examinations
Sota Goto, Takuya Kasue, Keiji Takahisa, Tatsuya Maeda, Kazuki Takegami, Takashi Asahara, Natsumi Kimoto, Hiroaki Hayashi
21st International Conference on Solid State Dosimetry (SSD21), June, 2025
Technological development of the relationship measurement between surface and internal doses during helical CT examinations: a phantom study
Kazuki Takegami, Tatsuya Maeda, Takashi Asahara, Natsumi Kimoto, Rina Nishigami, Daiki Kobayashi, Hiroaki Hayashi
21st International Conference on Solid State Dosimetry (SSD21), June, 2025
Impact of different X-ray tube positions on dose measurement results during CT examinations
Hiroaki Hayashi, Tatsuya Maeda, Kazuki Takegami, Sota Goto, Rina Nishigami, Daiki Kobayashi, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Kazuta Yamashita, Takeshi Konishi, Motochika Maki
21st International Conference on Solid State Dosimetry (SSD21), June, 2025
Effective Atomic Number Score in Calcified Plaque Evaluation: Approach Using Photon-Counting CT
Takashi Asahara, Mana Ikegami, Natsumi Kimoto, Rina Nishigami, Yusuke Morimitsu, Noriaki Akagi, Mitsugi Honda, Toru Miyoshi, Hiroaki Hayashi, Toshihiro Iguchi
The 4th International Conference on Radiological Physics and Technology (ICRPT), Apr., 2025
Novel procedure to derive relationship between surface and internal doses taking into consideration X-ray incident direction during helical CT examinations
Kazuki Takegami, Tatsuya Maeda, Sota Goto, Takashi Asahara, Natsumi Kimoto, Rina Nishigami, Daiki Kobayashi, Hiroaki Hayashi
The 4th International Conference on Radiological Physics and Technology (ICRPT), Apr., 2025
A novel algorithm for generating virtual high-contrast images based on X-ray attenuation analysis using an energy-resolving photon-counting detector
Rina Nishigami, Hiroaki Hayashi, Daiki Kobayashi, Natsumi Kimoto, Takashi Asahara, Tatsuya Maeda, Sota Goto, Yuki Kanazawa, Tomonobu Haba, Shuichiro Yamamoto
The 4th International Conference on Radiological Physics and Technology (ICRPT), Apr., 2025
Dental forensic application of effective atomic number images generated using photon-counting CT
Takashi Asahara, Hiroaki Hayashi, Shunsuke Okada, Chihiro Yamaguchi, Natsumi Kimoto, Sota Goto, Rina Nishigami, Yusuke Morimitsu, Toshihiro Iguchi
European Congress of Radiology (ECR), Mar., 2025
Patient CT dosimetry using an OSL dosimeter with consideration for X-ray incident direction
Hiroaki Hayashi, Sota Goto, Tatsuya Maeda, Kazuki Takegami, Rina Nishigami, Daiki Kobayashi, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa
European Congress of Radiology (ECR), Mar., 2025
Functional imaging using energy-resolving photon counting detector at the high-counting-rate clinical condition
Natsumi Kimoto, Rina Nishigami, Daiki Kobayashi, Takashi Asahara, Tatsuya Maeda, Sota Goto, Akitoshi Katsumata, Shuichiro Yamamoto, Hiroaki Hayashi
European Congress of Radiology (ECR), Mar., 2025
How can we use effective atomic number information generated by photon-counting computed tomography? – A proposal for application to dental forensics –
Takashi Asahara, Hiroaki Hayashi, Shunsuke Okada, Tatsuya Maeda, Natsumi Kimoto, Rina Nishigami, Daiki Kobayashi, Chihiro Yamaguchi, Yusuke Morimitsu, Noriaki Akagi, Toshihiro Iguchi
The 110th Scientific Assembly and Annual Meeting of the Radiological Society of North America, Nov., 2024
Clinical study of patient surface dose measurement taking into consideration the differences of the X-ray incident angle during chest CT examination
Sota Goto, Hiroaki Hayashi, Tatsuya Maeda, Daiki Kobayashi, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Kazuta Yamashita, Kosaku Higashino, Shinya Takarabe, Taku Kuramoto
24th Asia-Oceania Congress of Medical Physics (AOCMP), Oct., 2024
Pulse Pile-up Correction of Objects with Various Atomic Numbers for Clinical Applications Using a Photon Counting Detector
Natsumi Kimoto, Hiroaki Hayashi, Rina Nishigami, Daiki Kobayashi, Takashi Asahara, Tatsuya Maeda, Akitoshi Katsumata, Shuichiro Yamamoto
The 2024 IEEE Nuclear Science Symposium and Medical Imaging Conference, Oct., 2024
System design to realize functional and conventional images during single X-ray irradiation using a photon counting detector
Rina Nishigami, Hiroaki Hayashi, Daiki Kobayashi, Tatesuya Maeda, Takashi Asahara, Yuki Kanazawa, Natsumi Kimoto, Shuichiro Yamamoto
The 2024 IEEE Nuclear Science Symposium and Medical Imaging Conference, Oct., 2024
Discrimination of non-metal dental material using photon counting CT toward identifying human remains
Takashi Asahara, Shunsuke Okada, Chihiro Kurose, Hiroaki Hayashi, Rina Nishigami, Daiki Kobayashi, Sota Goto, Yusuke Morimitsu, Noriaki Akagi, Mitsugi Honda
The 3rd International Conference on Radiological Physics and Technology (ICRPT), Apr., 2024
Convenient procedure to determine a dose reduction factor of the collar-type thyroid shield used for the chest CT examination
Kazuki Takegami, Hiroaki Hayashi, Tatsuya Maeda, Sota Goto, Takashi Asahara, Rina Nishigami, Daiki Kobayashi, Shuichi Murakami, Takeshi Konishi, Motochika Maki
The 3rd International Conference on Radiological Physics and Technology (ICRPT), Apr., 2024
Suitability of High Tube Voltage Imaging for General Radiography When Using Energy Resolving Photon Counting Detectors
Rina Nishigami, Hiroaki Hayashi, Daiki Kobayashi, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Tomonobu Haba, Natsumi Kimoto, Shuichiro Yamamoto
The 3rd International Conference on Radiological Physics and Technology (ICRPT), Apr., 2024
A Correction Method for Image Blurring to Derive Accurate Quantitative Material Information Using an Energy Resolving Photon Counting Detector
Daiki Kobayashi, Hiroaki Hayashi, Rina Nishigami, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Akitoshi Katsumata, Natsumi Kimoto, Shuichiro Yamamoto
The 3rd International Conference on Radiological Physics and Technology (ICRPT), Apr., 2024
A Novel Analysis Method to Determine Surface Radiation Dose Taking into Account the Incident Angle of X-rays During a Helical Scanning CT Examination
Sota Goto, Hiroaki Hayashi, Tatsuya Maeda, Kazuki Takegami, Rina Nishigami, Daiki Kobayashi, Takashi Asahara, Yuki Kanazawa
The 3rd International Conference on Radiological Physics and Technology (ICRPT), Apr., 2024
A Novel Evaluation Procedure of X-ray Shielding Ability by Estimating X-ray Incident Direction During Helical CT Examination
Tatsuya Maeda, Hiroaki Hayashi, Sota Goto, Kazuki Takegami, Takashi Asahara, Daiki Kobayashi, Rina Nishigami, Takeshi Konishi, Shuichi Murakami, Motochika Maki
The 3rd International Conference on Radiological Physics and Technology (ICRPT), Apr., 2024
Direct Dose Measurement Method During Chest CT Examination by Taking into Consideration the X-ray Incident Direction
Hiroaki Hayashi, Tatsuya Maeda, Sota Goto, Kazuki Takegami, Takashi Asahara, Rina Nishigami, Daiki Kobayashi, Yuki Kanazawa, Kazuta Yamashita
European Congress of Radiology, ECR2024, Feb., 2024
Applicability of High Tube Voltage Imaging to Achieve Accurate Quantitative Images When Applying Photon Counting Detectors to General Radiography
Rina Nishigami, Hiroaki Hayashi, Daiki Kobayashi, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Natsumi Kimoto, Shuichiro Yamamoto
SPIE Medical Imaging 2024, Feb., 2024
Will General Radiography Become More Valuable When Exploiting the Performance of a Photon Counting Detector?
Daiki Kobayashi, Hiroaki Hayashi, Rina Nishigami, Cheonghae Lee, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Akitoshi Katsumata, Natsumi Kimoto, Shuichiro Yamamoto
The 109th Scientific Assembly and Annual Meeting of the Radiological Society of North America, Nov., 2023
How can we establish direct radiation dose measurement during CT examinations?
Hiroaki Hayashi, Tatsuya Maeda, Kazuki Takegami, Sota Goto, Rina Nishigami, Daiki Kobayashi, Takashi Asahara, Yuki Kanazawa, Kazuta Yamashita, Kosaku Higashino
The 109th Scientific Assembly and Annual Meeting of the Radiological Society of North America, Nov., 2023
Simulation study on functional images to optimize radiographic condition using energy resolving photon counting detector
Rina Nishigami, Hiroaki Hayashi, Daiki Kobayashi, Cheonghae Lee, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Natsumi Kimoto, Shuichiro Yamamoto
The 2023 IEEE Nuclear Science Symposium and Medical Imaging Conference, Nov., 2023
Automatic determination algorithm of intrinsic parameters on response function of energy-resolving photon counting imaging detector
Cheonghae Lee, Hiroaki Hayashi, Daiki Kobayashi, Rina Nishigami, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Akitoshi Katsumata, Natsumi Kimoto, Shuichiro Yamamoto
The 2023 IEEE Nuclear Science Symposium and Medical Imaging Conference, Nov., 2023
Feasibility study of X-ray shielding procedure for reducing thyroid dose caused by overranging effect during CT examination
Kazuki Takegami, Tatsuya Maeda, Hiroaki Hayashi, Rina Nishigami, Cheonghae Lee, Takashi Asahara, Sota Goto, Shuichiro Murakami, Takeshi Konishi, Motochika Maki
The 39th Japan Conference of Radiological Technologists（39JCRT）and the 30th East Asia Conference of Radiological Technologists (30EACRT), Sep., 2023
An active-type personal dosimeter having functions to derive both incident direction and absolute dose of scattered X-rays during clinical X-ray examinations
Takashi Asahara, Hiroaki Hayashi, Tatsuya Maeda, Daiki Kobayashi, Sota Goto, Rina Nishigami, Miku Ando, Cheonghae Lee, Yuki Kanazawa, Kazuta Yamashita, Naoki Maeda, Satoshi Imajo, Mitsugi Honda
20th International Conference on Solid State Dosimetry (SSD20), Sep., 2023
Exposure Dose Reduction in Medical X-ray Diagnostics for BMD Measurement
Tatsuya Maeda, Hiroaki Hayashi, Miku Ando, Rina Nishigami, Daiki Kobayashi, Cheonghae Lee, Takashi Asahara, Sota Goto, Kazuki Takegami, Kazuta Yamashita, Kosaku Higashino, Shuichi Murakami, Takeshi Konishi, Motochika Maki
20th International Conference on Solid State Dosimetry (SSD20), Sep., 2023
Evidence of exposure dose reduction outside the scanning region during fast scan chest CT examination through the use of an X-ray shield
Hiroaki Hayashi, Tatsuya Maeda, Kazuki Takegami, Rina Nishigami, Daiki Kobayashi, Cheonghae Lee, Takashi Asahara, Sota Goto, Miku Ando, Yuki Kanazawa, Kazuta Yamashita, Kosaku Higashino, Shuichi Murakami, Takeshi Konishi, Motochika Maki
20th International Conference on Solid State Dosimetry (SSD20), Sep., 2023
A novel function for wearable dosimeters: to determine both incident direction and absolute dose of X-rays during IVR procedure
Takashi Asahara, Hiroaki Hayashi, Tatsuya Maeda, Daiki Kobayashi, Sota Goto, Cheonghae Lee, Yuki Kanazawa, Naoki Maeda, Satoshi Imajo, Mitsugi Honda
The 2nd International Conference on Radiological Physics and Technology (ICRPT), Apr., 2023
A correction method for object edge blurring that is effective for quantitative analysis using photon counting imaging
Daiki Kobayashi, Hiroaki Hayashi, Cheonghae Lee, Rina Nishigami, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Akitoshi Katsumata, Natsumi Kimoto, Shuichiro Yamamoto
The 2nd International Conference on Radiological Physics and Technology (ICRPT), Apr., 2023
Suitability of High-Tube-Voltage Imaging When Using Energy Resolving Photon Counting Detector (ERPCD): Simulation Study
Rina Nishigami, Hiroaki Hayashi, Cheonghae Lee, Daiki Kobayashi, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Tomonobu Haba, Natsumi Kimoto, Shuichiro Yamamoto
The 2nd International Conference on Radiological Physics and Technology (ICRPT), Apr., 2023
Thyroid dose reduction related to the overranging effect by using a novel sponge-type shield during high-pitch chest CT examination
Kazuki Takegami, Hiroaki Hayashi, Tatsuya Maeda, Cheonghae Lee, Rina Nishigami, Takashi Asahara, Shuichi Murakami, Takeshi Konishi, Motochika Maki
The 2nd International Conference on Radiological Physics and Technology (ICRPT), Apr., 2023
Practical procedure to reduce thyroid dose related to the overranging effect during fast chest CT examination using a novel sponge shield with embedded fine bismuth particles
Kazuki Takegami, Hiroaki Hayashi, Tatsuya Maeda, Cheonghae Lee, Rina Nishigami, Takashi Asahara, Shuichi Murakami, Takeshi Konishi, Motochika Maki
European Congress of Radiology (ECR), Mar., 2023
A wearable active-type dosimeter having novel functions to derive both incident direction and absolute dose of scattered X-rays during IVR procedures
Takashi Asahara, Hiroaki Hayashi, Tatsuya Maeda, Sota Goto, Daiki Kobayashi, Cheonghae Lee, Yuki Kanazawa, Naoki Maeda, Mitsugi Honda
European Congress of Radiology (ECR), Mar., 2023
What Information Can We Derive From In-vivo Rectum Dose Measurement During RALS Irradiation?
Hiroaki Hayashi, Natsumi Kimoto, Tatsuya Maeda, Takashi Asahara, Sota Goto, Cheonghae Lee, Miku Ando, Yuki Kanazawa, Hitoshi Ikushima, Tohru Okazaki, Takuya Hashizume
RSNA2021, Chicago, Nov. 2021
Trial to Fabricate a Radiation Dosimeter Having Functions to Determine Both Incident Angle and Exposure Dose of Scattered X-rays
Takashi Asahara, Hiroaki Hayashi, Tatsuya Maeda, Satoshi Imajo, Miho Numata, Mitsugi Honda
3rd Technological Competency As Caring In The Health Sciences, On-line, Aug. 2021
How can we perform actual dose measurement? Clinically applicable procedures and its impact
Takashi Asahara, Hiroaki Hayashi, Natsumi Kimoto, Sota Goto, Kazuki Takegami, Tatsuya Maeda, Cheonghae Lee, Yuki Kanazawa, Kazuta Yamashita, Kosaku Higashino
RSNA2020, Chicago, Dec. 2020
Dose calibration factor of an OSL dosimeter during CT examination to measure exposure dose of patients taking into consideration proper X-ray quality
Kazuki Takegami, Hiroaki Hayashi, Takashi Asahara, Sota Goto, Emi Tomita, Natsumi Kimoto, Yuki Kanazawa, Shohei Kudomi
ECR2020, Vienna, Mar. 2020
Photon counting technique: How to analyze a novel quantitative image?
Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Takashi Asahara, Tatsuya Maeda, Akitoshi Katsumata, Yuki Kanazawa, Shuji Koyama, Shuichiro Yamamoto, Masahiro Okada
RSNA2019 Education Exhibit Presentation, Chicago, Dec. 2019
Importance of considering the response function of photon counting detectors with the goal of precise material identification
Takumi Asakawa, Hiroaki Hayashi, Natsumi Kimoto, Takashi Asahara, Tatsuya Maeda, Shuji Koyama, Shuichiro Yamamoto, Masahiro Okada
IEEE Nuclear Science Symposium and Medical Imaging Conference, Manchester, Oct. 2019
Feasibility study of photon counting detector for producing effective atomic number image
Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Takashi Asahara, Tatsuya Maeda, Yuki Kanazawa, Akitoshi Katsumata, Shuichiro Yamamoto, Masahiro Okada
IEEE Nuclear Science Symposium and Medical Imaging Conference, Manchester, Oct. 2019
Precise dose calibration method of OSL dosimeter with help of X-ray spectra toward exposure dose evaluation of eye lens
Takashi Asahara, Hiroaki Hayashi, Sota Goto, Emi Tomita, Natsumi Kimoto, Takumi Asakawa, Kazuki Takegami, Yuki Kanazawa, Tohru Okazaki, Takuya Hashizume
19th International Conference on Solid State Dosimetry (SSD19), Hiroshima, Sep. 2019
Practical calibration curve for a small-type OSL dosimeter to measure exposure dose of patients during medical X-ray diagnosis
Kazuki Takegami, Hiroaki Hayashi, Natsumi Kimoto, Sota Goto, Emi Tomita, Asahara Takashi, Yoshiki Mihara, Yuki Kanazawa
19th International Conference on Solid State Dosimetry (SSD19), Hiroshima, Sep. 2019
Development of a Clinically Applicable Rectum Dosimeter for Brachytherapy using an Optically Stimulated Luminescence Dosimeter
Emi Tomita, Hiroaki Hayashi, Takashi Asahara, Natsumi Kimoto, Sota Goto, Yuki Kanazawa, Yasufumi Shitakubo, Kanako Sakuragawa, Hitoshi Ikushima, Tohru Okazaki, Takuya Hashizume
19th International Conference on Solid State Dosimetry (SSD19), Hiroshima, Sep. 2019
Novel Disk-Shaped OSL Dosimeter Having Smaller Angular Dependence
Sota Goto, Hiroaki Hayashi, Emi Tomita, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Hidetoshi Yamaguchi, Morihito Shimizu
19th International Conference on Solid State Dosimetry (SSD19), Hiroshima, Sep. 2019
Determining the difference of calibration factors in diagnostic X-rays and mono-energetic X-rays of the small type OSL dosimeter for a more precise dose evaluation in diagnostic X-ray examinations
Tohru Okazaki, Hiroaki Hayashi, Sota Goto, Takashi Asahara, Emi Tomita, Yuki Kanazawa, Takuya Hashizume, Vergil Cruz, Cheng Wei Hsin
European Congress of Radiology, Vienna, Mar. 2019
Actual dose measurements of assistant during pediatric X-ray examination with a precisely calibrated optically stimulated luminescence dosimeter
Takashi Asahara, Hiroaki Hayashi, Emi Tomita, Yoshiki Mihara, Sota Goto, Yuki Kanazawa, Natsumi Kimoto, Takumi Asakawa, Tohru Okazaki
European Congress of Radiology, Vienna, Mar. 2019
Evaluation of dose to risk organ during brachytherapy for cervical cancer using a novel passive rectum dosimeter
Emi Tomita, Hiroaki Hayashi, Takashi Asahara, Yasufumi Shitakubo, Kanako Sakuragawa, Hitoshi Ikushima, Yuki Kanazawa, Tohru Okazaki, Takuya Hashizume
European Congress of Radiology, Vienna, Mar. 2019
Effective atomic number image produced with energy-resolved photon counting detector toward the development of next-generation plain X-ray diagnosis
Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Takashi Asahara, Akitoshi Katsumata, Yuki Kanazawa, Shuichiro Yamamoto, Masahiro Okada
European Congress of Radiology, Vienna, Mar. 2019
Trial study for development of a novel-formed dosimeter having lower angular dependence
Sota Goto, Hiroaki Hayashi, Emi Tomita, Natsumi Kimoto, Takumi Uehara, Yuki Kanazawa, Takumi Asakawa, Takashi Asahara, Tohru Okazaki, Takuya Hashizume
18th Asia-Oceania Congress of Medical Physics (AOCMP), Malaysia, Nov. 2018
Evaluating the energy dependence of the small type Optically Stimulated Luminescence (OSL) “nanoDot” dosimeters in the energy region of diagnostic X-rays by using Monte Carlo Simulation
Vergil L E Cruz, Tohru Okazaki, Hiroaki Hayashi, Takashi Asahara, Sota Goto, Yoshiki Mihara, Emi Tomita, Yuki Kanazawa, Natsumi Kimoto, Takuya Hashizume, Cheng Wei Hsin
18th Asia-Oceania Congress of Medical Physics (AOCMP), Malaysia, Nov. 2018
Reproduction of response functions of a multi-pixel-type energy-resolved photon counting detector while taking into consideration interaction of X-rays, charge sharing and energy resolution
Natsumi Kimoto, Hiroaki Hayashi, Takashi Asahara, Emi Tomita, Sota Goto, Yuki Kanazawa, Shuichiro Yamamoto, Masahiro Okada, Masashi Yamasaki
25th International Symposium on Room-Temperature Semiconductor X-ray & Gamma-ray Detectors, IEEE(MIC), Sydney, November. 2018
First Trial of Actual Dose Measurement of Organ at Risk During Brachytherapy for Cervical Cancer in Tokushima University Hospital
Emi Tomita, Hiroaki Hayashi, Takashi Asahara, Yasufumi Shitakubo, Kanako Sakuragawa, Hitoshi Ikushima, Yuki Kanazawa, Tohru Okazaki, Takuya Hashizume
Second International Seminar and Workshop on Technological Competency as Caring in the Health Science, Tokushima, Aug. 2018
Radiation dose measurement in pediatric CT examination using nanoDot dosimeters, a small type Optically Stimulated Luminescence (OSL) dosimeter
Vergil Lorenzo Estacio Cruz, Hiroaki Hayashi, Emi Tomita, Yuki Kanazawa, Sota Goto, Yoshiki Mihara, Natsumi Kimoto, Takashi Asahara, Keiji Tada, Ryosuke Kasai, Kosaku Higashino, Kazuta Yamashita, Tohru Okazaki, Takuya Hashizume
5th Asian and Oceanic IRPA Regional Congress on Radiation Protection (AOARP5), Melbourne, May. 2018
Proper Calibration Factor of Small Type OSL Dosimeter for Evaluating Eye Lens Dose of Operators during X-ray Fluoroscopic Procedure
Tohru Okazaki, Hiroaki Hayashi, Takashi Asahara, Sota Goto, Yoshiki Mihara, Emi Tomita, Yuki Kanazawa, Natsumi Kimoto, Takuya Hashizume, Vergil LE Cruz, Cheng Wei Hsin, Sumi Yokoyama
5th Asian and Oceanic IRPA Regional Congress on Radiation Protection (AOARP5), Melbourne, May. 2018
Preliminary study for eye lens dose evaluation of the medical staff during interventional fluoroscopy using Optically Stimulated Luminescence dosimeters
Tohru Okazaki, Hiroaki Hayashi, Takashi Asahara, Sota Goto, Yoshiki Mihara, Emi Tomita, Yuki Kanazawa, Natsumi Kimoto, Takuya Hashizume, Vergil L E Cruz, Cheng Wei Hsin, Sumi Yokoyama, Ikuo Kobayashi
51st Annual meeting of Taiwan Society of Radiation Technology, Taiwan, Mar. 2018
Phantom study using an OSL dosimeter with the aim of accurate measurement of eye lens dose exposure of operator during transfemoral cardiac catheterization using fluoroscopic examination
Takashi Asahara, Hiroaki Hayashi, Emi Tomita, Sota Goto, Natsumi Kimoto, Kenji Yamada, Sumi Yokoyama, Yuki Kanazawa, Tohru Okazaki
European Congress of Radiology, Vienna, Mar. 2018
Energy dependence of nanoDot OSL dosimeters to low energy X-Rays using Monte-Carlo simulation code EGS5
Cruz LE Vergil, Sota Goto, Tohru Okazaki, Hiroaki Hayashi, Emi Tomita, Yoshiki Mihara, Takashi Asahara, Takuya Hashizume, Cheng Wei Hsin, Ikuo Kobayashi
AOCMP-AMPICON 2017, Jaipur, Nov. 2017
Potential of photon counting technique for next-generation type X-Ray diagnostic system -To provide new medical image concerning effective atomic numbers using plain X-Ray-
Natsumi Kimoto, Hiroaki Hayashi, Takashi Asahara, Emi Tomita, Sota Goto, Yoshiki Mihara, Yuki Kanazawa, Tsutomu Yamakawa, Shuichiro Yamamoto, Masashi Yamasaki, Masahiro Okada, Daisuke Hashimoto
Radiological Society of North America (RSNA), Chicago, Nov. 2017
Development of a new in-vivo measurement system by means of OSL dosimeters during brachytherapy for cervical cancer
Hiroaki Hayashi, Emi Tomita, Takashi Asahara, Yasufumi Shitakubo, Kanako Sakuragawa, Hiroshi Saegusa, Hitoshi Ikushima, Yuki Kanazawa, Sota Goto, Natsumi Kimoto, Yoshiki Mihara, Yoshinori Miyahara, Tohru Okazaki, Takuya Hashizume, Lorenzo Estacio Vergil Cruz
Radiological Society of North America (RSNA), Chicago, Nov. 2017
Precise calibration factor of small-type OSL dosimeter with the aim toward analysis of exposure doses caused by scattering X-Ray in the diagnostic region
Yoshiki Mihara, Hiroaki Hayashi, Takashi Asahara, Sota Goto, Natsumi Kimoto, Yuki Kanazawa, Tohru Okazaki
The 3rd International Conference on Radiological Science and Technology, Hiroshima, Oct. 2017
Development of a Novel Rectum Dosimeter for Evaluation of Organ Dose Exposure during Brachytherapy using High-Dose-Rate Ir-192
Takashi Asahara, Hiroaki Hayashi, Emi Tomita, Kanako Sakuragawa, Yasufumi Shitakubo, Hitoshi Ikushima, Tohru Okazaki
The 3rd International Conference on Radiological Science and Technology, Hiroshima, Oct. 2017
Novel material identification method using three energy bins of a photon counting detector taking into consideration Z-dependent beam hardening effect correction with the aim of producing an X-Ray image with information of effective atomic number
Natsumi Kimoto, Hiroaki Hayashi, Takashi Asahara, Emi Tomita, Sota Goto, Yoshiki Mihara, Kanazawa Yuki, Tsutomu Yamakawa, Shuichiro Yamamoto, Masashi Yamasaki, Masahiro Okada, Daisuke Hashimoto
2017 IEEE Nuclear Science Symposium; Medical Imaging Conference, Atlanta, Oct. 2017
Energy and Angular Dependence of the small type OSL Dosimeter in Diagnostic and Nuclear Medicine Regions using Monte Carlo Simulation
Cruz Lorenzo E. Vergil, Tohru Okazaki, Hiroaki Hayashi, Yoshiki Mihara, Takashi Asahara, Natsumi Kimoto, Hiroki Okino, Yuki Kanazawa, Takuya Hashizume, Ikuo Kobayashi
International Symposium On Radiation Safety and Detection Technology (ISORD-9), Nagoya, Jul. 2017
Direct Radiation Dose Measurement of Rectum during High-Dose-Rate 192Ir Brachytherapy for Cervical Cancer Treatment
Emi Tomita, Hiroaki Hayashi, Takashi Asahara, Kanako Sakuragawa, Yasufumi Shitakubo, Hiroshi Saegusa, Hitoshi Ikushima, Yuki Kanazawa, Sota Goto, Tohru Okazaki, Takuya Hashizume, Cruz LE Vergil
International Symposium On Radiation Safety and Detection Technology (ISORD-9), Nagoya, Jul. 2017
Applicability of Practical Calibration of a Small-type OSL Dosimeter For Measuring the Exposure Doses Effected by Scattered and Penetrating X-rays
Tohru Okazaki, Hiroaki Hayashi, Yoshiki Mihara, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Kousaku Higashino, Kazuta Yamashita, Sumi Yokoyama, Kazuki Takegami, Takuya Hashizume, Cruz LE Vergil
International Symposium On Radiation Safety and Detection Technology (ISORD-9), Nagoya, Jul. 2017
Direct Dose Measurement of Patients during Pediatric Computed Tomography Examination
Hiroaki Hayashi, Emi Tomita, Sota Goto, Natsumi Kimoto, Keiji Tada, Ryosuke Kasai, Yuki Kanazawa, Yoshiki Mihara, Takashi Asahara, Tohru Okazaki, Takuya Hashizume, Cruz LE Vergil
International Symposium On Radiation Safety and Detection Technology (ISORD-9), Nagoya, Jul. 2017
Development of Novel Rectum Dosimeter using OSL sheet with the aim of Direct Dose Measurement of Organ Dose during Brachytherapy
Takashi Asahara, Hiroaki Hayashi, Emi Tomita, Kanako Sakuragawa, Hiroshi Saegusa, Yasufumi Shitakubo, Hitoshi Ikushima, Yuki Kanazawa, Yoshiki Mihara, Yoshinori Miyahara, Tohru Okazaki, Takuya Hashizume, Cruz LE Vergil
International Symposium On Radiation Safety and Detection Technology (ISORD-9), Nagoya, Jul. 2017
Preliminary study for exposure dose measurement of people assisting during a pediatric X-ray procedure by means of a small-type OSL dosimeter
Hiroaki Hayashi, Yoshiki Mihara, Natsumi Kimoto, Takashi Asahara, Kenji Yamada, Yuki Kanazawa, Masafumi Harada, Tohru Okazaki, Takuya Hashizume
European Congress of Radiology, Vienna, Mar. 2017
Development of a novel method based on a photon counting technique with the aim of precise material identification in clinical X-ray diagnosis
Natsumi Kimoto, Hiroaki Hayashi, Takashi Asahara, Yuki Kanazawa, Tsutomu Yamakawa, Shuichiro Yamamoto, Masashi Yamasaki, Masahiro Okada
SPIE Medical Imaging, Florida, United States, Feb. 2017
Response functions of multi-pixel type CdTe detector, --- toward development of precise material identification in diagnosti x-ray images by means of photon counting ---
Hiroaki Hayashi, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Tsutomu Yamakawa, Shuichiro Yamamoto, Masashi Yamasaki, Masahiro Okada
SPIE Medical Imaging, Florida, United States, Feb. 2017
Calculation of energy and angular dependences of the small-type OSL dosimeter in the diagnostic and nuclear medicine regions using the Monte-Carlo simulation code
Tohru Okazaki, Hiroaki Hayashi, Hiroki Okino, Yoshiki Mihara, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Kazuki Takegami, Takuya Hashizume, Ikuo Kobayashi, Reginaldo A. Kaila Ann Mary
22nd International Conference on Medical Physics ICMP, Bangkok, Dec. 2016
Basic study for material identification toward development of a next generation type X-ray diagnosis detector based on a photon counting technique
Natsumi Kimoto, Hiroaki Hayashi, Takashi Asahara, Yoshiki Mihara, Yuki Kanazawa, Tsutomu Yamakawa, Shuichiro Yamamoto, Masashi Yamasaki, Masahiro Okada
22nd International Conference on Medical Physics ICMP, Bangkok, Dec. 2016

National Conference icon Domestic Conference

Clinical Trial to Quantitative Analysis of Coronary Artery Plaque Using Hydroxyapatite Images Generated with Photon Counting Detector CT [in Japanese]
Mana Mitani (Ikegami), Takashi Asahara, Yusuke Morimitsu, Noriaki Akagi, Tomohiro Inoue, Hiroaki Hayashi, Mitsugi Honda
The 81st Annual Meeting of the Japan Society of Radiological Technology (JRC2025), April, 2025
Development of a real-time OSL dosimeter with minimal effect on medical CT images for patient dose measurement [in Japanese]
Sota Goto, Takuya Kasue, Keiji Takahisa, Tatsuya Maeda, Kazuki Takegami, Takashi Asahara, Hiroaki Hayashi
The 81st Annual Meeting of the Japan Society of Radiological Technology (JRC2025), April, 2025
Examination of reconstruction of auditory ossicle images with Photon Counting Detector CT [in Japanese]
Soichiro Nishii, Toshihiro Iguchi, Yusuke Morimitsu, Sota Kajisaki, Takashi Asahara, Saya Inoue, Noriaki Akagi, Mitsugi Honda
All Japan Radiological Technology / The 52nd Autumn Scientific Congress, October, 2024
Proposal of a coronary plaque analysis method using photon-counting detector CT [in Japanese]
Mana Ikegami, Takashi Asahara, Yusuke Morimitsu, Noriaki Akagi, Tomohiro Inoue, Hiroaki Hayashi, Mitsugi Honda
The 20th Chugoku-Shikoku Forum for Radiological Technology (CSFRT2024), October, 2024
Evaluation of the conversion accuracy between CT values and electron density for dose calculation using photon-counting detector CT [in Japanese]
Moe Tsujimura, Takashi Asahara, Kazutaka Morishita, Yoshinori Tanabe, Toshihiro Ikuchi, Hideki Aoyama, Yuta Otsuka, Yuta Kawai, Mitsugi Honda, Kotaro Yoshio
The 20th Chugoku-Shikoku Forum for Radiological Technology (CSFRT2024), October, 2024
Simulation study on the shielding ability of lead for protecting the eye lens of the eye of medical staff during Lu-177 radionuclide therapy [in Japanese]
Saya Inoue, Takashi Asahara, Toshihiro Iguchi, Daisuke Hasegawa, Keisuke Yoshitomi, Sota Goto
The 20th Chugoku-Shikoku Forum for Radiological Technology (CSFRT2024), October, 2024
Special session on photon-counting CT, technical edition: Understanding PCD-CT through detector innovations [in Japanese]
Takashi Asahara
The 9th Chugoku SOMATOM Users Meeting, September, 2024
Design of a novel active-type dosimeter capable of analyzing incident angles of scattered X-rays and validation study for use in interventional radiology [in Japanese]
Naoki Maeda, Takashi Asahara, Takatsugu Yamauchi, Mitsugi Honda, Hiroaki Hayashi, Tatsuya Maeda, Daiki Kobayashi, Tomohiro Inoue, Daichi Kobayashi, Mana Ikegami
The 19th Chugoku-Shikoku Forum for Radiological Technology (CSFRT2023), November, 2023
Photon-counting CT from practical experience: Understanding detector innovations [in Japanese]
Takashi Asahara
The 18th Annual Meeting of the Kyushu Radiological Medical Technology, Symposium, November, 2023
Discrimination of non-metal dental materials by effective atomic number images using photon counting CT [in Japanese]
Takashi Asahara, Shunsuke Okada, Cheonghae Lee, Hiroaki Hayashi, Chihiro Kurose, Yusuke Morimitsu, Noriaki Akagi, Mitsugi Honda, Rina Nishigami, Daiki Kobayashi
The 51st Autumn Scientific Congress, October, 2023
Fundamental Study for Calculation of Agatston Score of Coronary Artery Calcifi cation Using Photon Counting Detector CT [in Japanese]
Mana Ikegami, Takashi Asahara, Naoki Maeda, Yusuke Morimitsu, Keisuke Yoshitomi, Noriaki Akagi, Mitsugi Honda
The 51st Autumn Scientific Congress, October, 2023
Fundamental Study on Tube Voltage Selection in Pediatric Cardiac CT by Using the Photon Counting Detector CT [in Japanese]
Junya Nakamura, Tomohiro Inoue, Takashi Asahara, Yusuke Morimitsu, Mana Ikegami, Noriaki Akagi, Mitsugi Honda
The 51st Autumn Scientific Congress, October, 2023
Direct dose measurement using disposable-type rectum dosimeter during cervical cancer treatment [in Japanese]
Hiroaki Hayashi, Tatsuya Maeda, Takashi Asahara, Sota Goto, Kazuki Takegami, Cheonghae Lee, Miku Ando, Yuki Kanazawa, Hitoshi Ikushima, Tohru Okazaki, Takuya Hashizume
The 3rd Joint Meeting of Japanese Society of Radiation Safety Management and Japan Health Physics Society, December, 2021
A Novel Algorithm for Material Identification Based on a Photon Counting Technique -Toward the Development of a Quantitative Plain X-ray Diagnosis Using an Effective Atomic Number Image-
Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Takashi Asahara, Akitoshi Katsumata, Shuichiro Yamamoto, Masahiro Okada
The 76th Annual Meeting of the Japan Society of Radiological Technology, April, 2020
Dual-type active dosimeter having a novel algorithm to identify incident angles of X-rays
Takashi Asahara, Hiroaki Hayashi, Tatsuya Maeda, Yuki Kanazawa, Satoshi Imajo, Miho Numata, Mitsugi Honda
The 76th Annual Meeting of the Japan Society of Radiological Technology, April, 2020
Phantom study using novel shaped OSL dosimeters having smaller angular dependence toward actual dose measurement during clinical X-ray examination
Sota Goto, Hiroaki Hayashi, Emi Tomita, Takashi Asahara, Kaho Ikushima, Momoka kuwabara, Yuki Kanazawa
The 76th Annual Meeting of the Japan Society of Radiological Technology, April, 2020
Development of a disposable rectal dosimeter for in vivo measurement in intracavitary irradiation for cervical cancer [in Japanese]
Emi Tomita, Hiroaki Hayashi, Takashi Asahara, Yasufumi Shitakubo, Kanako Sakuragawa, Yuki Kanazawa, Hitoshi Ikushima
The 21st Annual Meeting of the Japanese Group of Brachytherapy, May, 2019
Monte-Carlo Simulation of Photon Counting Detector towards Production of Effective Atomic Number Images Using Continuous X-rays
Takumi Asakawa, Hiroaki Hayashi, Natsumi Kimoto, Takashi Asahara, Emi Tomita, Shuichiro Yamamoto, Masahiro Okada
The 75th Annual Meeting of the Japan Society of Radiological Technology, April, 2019
Actual Dose Measurement of Assistants while Positioning Patients during Pediatric X-ray Examination Using a Small-type Optically Stimulated Luminescence Dosimeter
Takashi Asahara, Hiroaki Hayashi, Yoshiki Mihara, Emi Tomita, Yuki Kanazawa, Kenji Yamada, Tohru Okazaki
The 75th Annual Meeting of the Japan Society of Radiological Technology, April, 2019
Precise evaluation of the energy dependence of a small type OSL dosimeter on diagnostic X-rays [in Japanese]
Toru Okazaki, Hiroaki Hayashi, Sota Goto, Takashi Asahara, Emi Tomita, Yuki Kanazawa, Takuya Hashizume, Vergil Cruz, Cheng Wei Hsin
The 17th Annual Meeting of Japanese Society of Radiation Safety Management, December, 2018
Reliability evaluation on eye lens dose measurement of medical staff during IR by using small type OSL dosimeter [in Japanese]
Toru Okazaki, Takashi Asahara, Takuya Hashizume, Vergil Cruz, Cheng Wei Hsin, Hiroaki Hayashi, Emi Tomita, Sota Goto, Yoshiki Mihara, Yuki Kanazawa, Sumi Yokoyama
The 51st Annual Meeting of Japan Health Physics Society, June, 2018
Direct dose measurement of rectum dose during 192Ir HDR-RALS for cervical cancer treatment [in Japanese]
Yasufumi Shitakubo, Kanako Sakuragawa, Hiroaki Hayashi, Emi Tomita, Takashi Asahara, Hitoshi Ikushima, Toru Okazaki
The 20th Annual Meeting of the Japanese Group of Brachytherapy, June, 2018
Potentiality of Effective Atomic Number Image Based on Photon Counting Technique for Achieving Proper Diagnosis Using Plain X-ray
Natsumi Kimoto, Hiroaki Hayashi, Takashi Asahara, Akitoshi Katsumata, Tsutomu Yamakawa, Shuichiro Yamamoto, Masahiro Okada
The 74th Annual Meeting of the Japan Society of Radiological Technology(Next Generation Session & Oral Presentation), April, 2018
Rectum Dose Measurements Using Novel Dosimetric System During High-Dose-Rate 192Ir Brachytherapy Treatment of Cervical Cancer
Emi Tomita, Hiroaki Hayashi, Yasufumi Shitakubo, Kanako Sakuragawa, Yuki Kanazawa, Hitoshi Ikushima, Tohru Okazaki, Takashi Asahara, Takuya Hashizume, Yoshinori Miyahara
The 74th Annual Meeting of the Japan Society of Radiological Technology(Next Generation Session & Oral Presentation), April, 2018
Proposal of Accurate Calibration for Measuring Eye Lens Dose of the Operator during Transfemoral Cardiac Catheterization with Fluoroscopic System Using an OSL dosimeter
Takashi Asahara, Hiroaki Hayashi, Emi Tomita, Sota Goto, Sumi Yokoyama, Yuki Kanazawa, Tohru Okazaki
The 74th Annual Meeting of the Japan Society of Radiological Technology, April, 2018
Determination of individual efficiency of small type OSL dosimeter toward high accuracy measurement [in Japanese]
Sota Goto, Hiroaki Hayashi, Yoshiki Mihara, Takashi Asahara, Emi Tomita, Yuki Kanazawa, Toru Okazaki, Takuya Hashizume, Vergil LE Cruz
The 45th Autumn Meeting of the Japan Society of Radiological Technology, October, 2017
In-vivo dosimetry using a self-made rectal dosimeter for intraluminal irradiation using iridium 192 for cervical cancer [in Japanese]
Yasufumi Shitakubo, Kanako Sakuragawa, Hiroaki Hayashi, Emi Tomita, Takashi Asahara, Hitoshi Ikushima, Toru Okazaki, Yuji Saegusa, Takuya Hashizume, Vergil LE Cruz
The 45th Autumn Meeting of the Japan Society of Radiological Technology, October, 2017
Uncertainty evaluation of small type OSL dosimeter toward the direct measurement of diagnostic X-ray dose [in Japanese]
Toru Okazaki, Takuya Hashizume, Vergil Cruz, Hiroaki Hayashi, Emi Tomita, Sota Goto, Natsumi Kimoto, Yoshiki Mihara, Takashi Asahara, Kazuki Takegami, Ikuo Kobayashi
The 50th Annual Meeting of the Japan Health Physics Society & the 16th Annual Meeting of the Japanese Society of Radiation Safety Management (Joint Conference), June, 2017
Basic study on entrance skin dose measurement by means of small type OSL dosimeter in neonate Computed Tomography [in Japanese]
Toru Okazaki, Takuya Hashizume, Vergil Cruz, Hiroaki Hayashi, Emi Tomita, Sota Goto, Ryosuke Kasai, Natsumi Kimoto, Yoshiki Mihara, Takashi Asahara, Keiji Tada, Ikuo Kobayashi
The 50th Annual Meeting of the Japan Health Physics Society & the 16th Annual Meeting of the Japanese Society of Radiation Safety Management (Joint Conference), June, 2017
Simulation study for effective reduction procedure of scattered Xrays toward high accuracy material identification based on photon counting technique
Takashi Asahara, Kimoto Natsumi, Hiroaki Hayashi, Yuki Kanazawa, Katsumata Akitoshi, Nishiyama Wataru, Yamakawa Tsutomu, Yamamoto Shuichiro, Yamasaki Masashi and Okada Masahiro
The 113th Scientific Meeting of the Japan Society of Medical Physics, April, 2017
Current status and issues in measuring assistant exposure during pediatric X-ray examinations using a small OSL dosimeter [in Japanese]
Hiroaki Hayashi, Yoshiki Mihara, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Kenji Yamada, Ryosuke Kasai, Toru Okazaki, Takuya Hashizume, Ikuo Kobayashi
The 176th Autumn Meeting of the Medical Imaging and Information Sciences Society of Japan (MII), October, 2016
Evaluation of angular dependence of the small type OSL dosimeter for gamma rays of 137Cs and 60Co using simulation code EGS5 [in Japanese]
Hiroki Okino, Takashi Asahara, Yoshiki Mihara, Hiroaki Hayashi, Yuki Kanazawa, Toru Okazaki, Takuya Hashizume, Ikuo Kobayashi
The 44th Autumn Meeting of the Japan Society of Radiological Technology, October, 2016
Fundamental study for material identification to develop next generation type X-ray diagnosis
Natsumi Kimoto, Takashi Asahara, Hiroaki Hayashi, Yamakawa Tsutomu, Yamamoto Shuichiro, Yamasashi Masaki and Okada Masahiro
Tokushima Bioscience Retreat, September, 2016