Simulation study on functional images to optimize radiographic condition using energy resolving photon counting detector International coauthorship

Rina Nishigami, Hiroaki Hayashi, Daiki Kobayashi, Cheonghae Lee, Tatsuya Maeda, Takashi Asahara, Yuki Kanazawa, Natsumi Kimoto, Shuichiro Yamamoto

2023 IEEE Nuclear Science Symposium, Medical Imaging Conference and International Symposium on Room-Temperature Semiconductor Detectors (NSS MIC RTSD)   2023.11

A wearable active-type X-ray dosimeter having novel functions to derive both incident direction and absolute exposure dose Reviewed International coauthorship

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 - 110932   2023.3

A wearable active-type dosimeter having novel functions to derive both incident direction and absolute dose of scattered X-rays during IVR procedures International coauthorship

Takashi Asahara, Hiroaki Hayashi, Tatsuya Maeda, Sota Goto, Daiki Kobayashi, Cheonghae Lee, Yuki Kanazawa, Naoki Maeda, Mitsugi Honda

EPOS, European Congress of Radiology 2023   2023.3

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 International coauthorship

Kazuki Takegami, Hiroaki Hayashi, Tatsuya Maeda, Cheonghae Lee, Rina Nishigami, Takashi Asahara, Shuichi Murakami, Takeshi Konishi, Motochika Maki

EPOS, European Congress of Radiology 2023   2023.3

Thyroid dose reduction shield with the generation of less artifacts used for fast chest CT examination Reviewed International coauthorship

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 - 110635   2023.2

A disposable OSL dosimeter for in vivo measurement of rectum dose during brachytherapy Reviewed

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   2021.7

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 Reviewed International coauthorship

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   2021.4

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

EPOS, European Congress of Radiology 2020   2020.3

An idea to reduce angular dependence of dosimeter having a disk-shaped detection region Reviewed

Sota Goto, Hiroaki Hayashi, Emi Tomita, Takashi Asahara, Natsumi Kimoto, Kazuki Takegami, Takumi Asakawa, Yuki Kanazawa, Tohru Okazaki, Takuya Hashizume

Radiation Measurements   137   2020

Evaluation of calibration factor of OSLD toward eye lens exposure dose measurement of medical staff during IVR Reviewed

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

Feasibility study of photon counting detector for producing effective atomic number image Reviewed

Natsumi Kimoto, Hiroaki Hayashi, Takumi Asakawa, Takashi Asahara, Tatsuya Maeda, Yuki Kanazawa, Akitoshi Katsumata, Shuichiro Yamamoto, Masahiro Okada

2019 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)   2019.10

Importance of Considering the Response Function of Photon Counting Detectors with the Goal of Precise Material Identification Reviewed

Takumi Asakawa, Hiroaki Hayashi, Natsumi Kimoto, Takashi Asahara, Tatsuya Maeda, Shuji Koyama, Shuichiro Yamamoto, Masahiro Okada

2019 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)   2019.10

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 LE Cruz, W. H

EPOS, European Congress of Radiology 2019   2019.3

Direct radiation dose measurement of rectum during High-Dose-Rate 192Ir brachytherapy for cervical cancer treatment Reviewed International coauthorship

Emi Tomita, Hiroaki Hayashi, Takashi Asahara, Kanako Sakuragawa, Yasufumi Shitakubo, Hiroshi Saegusa, Hitoshi Ikushima, Yuki Kanazawa, Sota Goto, Tohru Okazaki, Takuya Hashizume, Vergil Lorenzo E. Cruz

Progress in Nuclear Science and Technology   6   39 - 42   2019.1

Direct dose measurement of patients during pediatric computed tomography examination Reviewed International coauthorship

Hiroaki Hayashi, Emi Tomita, Sota Goto, Natsumi Kimoto, Keiji Tada, Ryosuke Kasai, Yuki Kanazawa, Yoshiki Mihara, Takashi Asahara, Tohru Okazaki, Takuya Hashizume, Vergil Lorenzo E. Cruz

Progress in Nuclear Science and Technology   6   18 - 21   2019.1

Energy and angular dependence of the small-type OSL dosimeter in nuclear medicine regions using Monte Carlo simulation Reviewed International coauthorship

Vergil Lorenzo E. 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   34 - 38   2019.1

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 Reviewed International coauthorship

Tohru Okazaki, Hiroaki Hayashi, Yoshiki Mihara, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Kosaku Higashino, Kazuta Yamashita, Sumi Yokoyama, Kazuki Takegami, Takuya Hashizume, Vergil Lorenzo E. Cruz, Ikuo Kobayashi

Progress in Nuclear Science and Technology   6   22 - 25   2019.1

Development of novel rectum dosimeter using OSL sheet with the aim of direct dose measurement of organ dose during brachytherapy Reviewed International coauthorship

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 Lorenzo E. Cruz

Progress in Nuclear Science and Technology   6   30 - 33   2019.1

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

2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC)   2018.11

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 Reviewed

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   2018.10

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 International coauthorship

Takashi Asahara, Hiroaki Hayashi, Emi Tomita, Sota Goto, Natsumi Kimoto, Kenji Yamada, Sumi Yokoyama, Yuki Kanazawa, Tohru Okazaki

European Congress of Radiology, EPOS   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

Natsumi Kimoto, Hiroaki Hayashi, Takashi Asahara, Emi Tomita, Sota Goto, Yoshiki Mihara, Yuki Kanazawa, Tsutomu Yamakawa, Shuichiro Yamamoto, Masashi Yamasaki, Masahiro Okada, Daisuke Hashimoto

2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)   2017.10

Precise material identification method based on a photon counting technique with correction of the beam hardening effect in X-ray spectra Reviewed

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   2017.6

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

EPOS, European Congress of Radiology 2017   2017.3

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

Medical Imaging 2017: Physics of Medical Imaging   2017.3

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, Takashi Asahara, Natsumi Kimoto, Yuki Kanazawa, Tsutomu Yamakawa, Shuichiro Yamamoto, Masashi Yamasaki, Masahiro Okada

Medical Imaging 2017: Physics of Medical Imaging   2017.3

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)  2024.4 

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  2024.2 

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  2024.2 

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  2023.11 

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  2023.11 

散乱X線の入射角度を解析できる新しい概念のアクティブ型線量計の設計とIVRでの使用を想定した実証実験

前田直輝, 淺原孝, 山内崇嗣, 本田貢, 林裕晃, 前田達哉, 小林大空, 井上智洋, 小林大地, 池上愛

第19回中四国放射線医療技術フォーラムCSFRT2023  2023.11 

使用経験から知るフォトンカウンティングCT ～検出器の技術革新を理解する～ Invited

淺原 孝

第18回 九州放射線医療技術学術大会シンポジウム  2023.11 

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  2023.11 

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  2023.11 

フォトンカウンティングCTを用いた実効原子番号画像による非金属歯科材料の弁別

淺原孝, 岡田俊輔, 李青海, 林裕晃, 黒瀬千尋, 森光祐介, 赤木憲明, 本田貢, 西上莉奈, 小林大空

第51回日本放射線技術学会秋季学術大会  2023.10 

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)  2023.9 

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)  2023.9 

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)  2023.9 

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)  2023.9 

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

2nd International Conference on Radiological Physics and Technology (ICRPT)  2023.4 

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

2nd International Conference on Radiological Physics and Technology (ICRPT)  2023.4 

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

2nd International Conference on Radiological Physics and Technology (ICRPT)  2023.4 

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

2nd International Conference on Radiological Physics and Technology (ICRPT)  2023.4 

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)  2023.3 

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)  2023.3 

ディスポ型自作直腸線量計を用いた子宮頸がん治療における線量の実測

林 裕晃, 前田達哉, 淺原 孝, 後藤聡汰, 竹上和希, 李 青海, 安藤未来, 金澤裕樹, 生島仁史, 岡崎 徹, 橋詰拓弥

第3回日本放射線安全管理学会・日本保健物理学会合同大会  2021.12 

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  2021.11 

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  2021.8 

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  2020.12 

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

第76回日本放射線技術学会総会学術大会  2020.4 

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

第76回日本放射線技術学会総会学術大会  2020.4 

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

第76回日本放射線技術学会総会学術大会  2020.4 

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  2020.3 

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  2019.12 

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  2019.10 

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  2019.10 

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)  2019.9 

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)  2019.9 

医療用連続X線を用いたフォトンカウンティング検出器による実効原子番号画像

紀本夏実, 林裕晃, 淺川巧, 淺原孝, 前田達哉, 金澤裕樹, 勝又明敏, 山本修一郎, 岡田雅宏

第2回量子線イメージング研究会  2019.9 

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)  2019.9 

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)  2019.9 

子宮頸癌の腔内照射における直腸線量実測に向けたディスポーザブル型直腸線量計の開発

冨田恵美, 林裕晃, 淺原孝, 下窪康史, 櫻川加奈子, 金澤裕樹, 生島仁史

日本放射線腫瘍学会小線源治療部会第21回学術大会  2019.5 

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

第75回放射線技術学会総会学術大会  2019.4 

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

第75回放射線技術学会総会学術大会  2019.4 

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  2019.3 

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  2019.3 

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  2019.3 

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  2019.3 

小型OSL線量計の診断用X線に対する応答のエネルギー依存性の精密評価

岡崎徹, 林裕晃, 後藤聡汰, 淺原孝, 冨田恵美, 金澤裕樹, 橋詰拓弥, Vergil Cruz, Cheng Wei Hsin

日本放射線安全管理学会 第17回 学術大会  2018.12 

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)  2018.11 

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)  2018.11 

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)  2018.11 

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

2nd International Seminar and Workshop on Technological Competency as Caring in the Health Science  2018.8 

小型OSL線量計を用いたIVR術者水晶体被ばく線量測定に向けた線量値の信頼性の検証

岡崎 徹, 淺原 孝, 橋詰 拓弥, Vergil Cruz, Cheng Wei Hsin, 林 裕晃, 冨田 恵美, 後藤 聡汰, 三原 由樹, 金澤 裕樹, 横山 須美

日本保健物理学会第51回研究発表会  2018.6 

192Irを用いたHDR-RALSによる子宮頸癌治療時の直腸線量の実測

下窪 康史, 櫻川 加奈子, 林 裕晃, 冨田 恵美, 淺原 孝, 生島 仁史, 岡崎 徹

公益社団法人日本放射線腫瘍学会小線源部会 第20回学術大会  2018.6 

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  2018.5 

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  2018.5 

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)  2018.5 

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)  2018.5 

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

第74回日本放射線技術学会総会学術大会  2018.4 

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

第74回日本放射線技術学会総会学術大会  2018.4 

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

第74回日本放射線技術学会総会学術大会  2018.4 

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, Cruz Lorenzo, Estacio Vergil

RSNA2017  2017.11 

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  2017.11 

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

RSNA2017  2017.11 

子宮頸癌に対するイリジウム192を用いた腔内照射における自作直腸線量計を用いたin-vivoドジメトリー

下窪 康史, 櫻川 加奈子, 林 裕晃, 冨田 恵美, 浅原 孝, 生島 仁史, 岡崎 徹, 三枝 裕司, 橋詰 拓弥, Vergil LE Cruz

第45回日本放射線技術学会秋季学術大会  2017.10 

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  2017.10 

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  2017.10 

小型OSL線量計を用いた超精密測定に向けた固有効率の決定

後藤 聡汰, 林 裕晃, 三原 由樹, 淺原 孝, 冨田 恵美, 金澤 裕樹, 岡崎 徹, 橋詰 拓弥, Vergil LE Cruz

第45回日本放射線技術学会秋季学術大会  2017.10 

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  2017.10 

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)  2017.7 

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)  2017.7 

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)  2017.7 

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)  2017.7 

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)  2017.7 

小型OSL線量計を用いた新生児CT撮影時における入射表面線量の実測への検討

岡崎 徹, 橋詰 拓弥, Vergil Cruz, 林 裕晃, 冨田 恵美, 後藤 聡汰, 笠井 亮佑, 紀本 夏実, 三原 由樹, 淺原 孝, 多田 佳司, 小林 育夫

日本保健物理学会第50回研究発表会 日本放射線安全管理学会第16回学術大会 合同大会  2017.6 

放射線診断における被ばく線量の実測に向けた小型OSL線量計の線量校正の信頼性評価

岡崎 徹, 橋詰 拓弥, Vergil Cruz, 林 裕晃, 冨田 恵美, 後藤 聡汰, 紀本 夏実, 三原 由樹, 淺原 孝, 竹上 和希, 小林 育夫

日本保健物理学会第50回研究発表会 日本放射線安全管理学会第16回学術大会 合同大会  2017.6 

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, Okada Masahiro

第113回日本医学物理学会学術大会  2017.4 

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  2017.3 

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, Asahara Takashi, Kimoto Natsumi, Yuki Kanazawa, Yamakawa Tsutomu, Yamamoto Shuichiro, Yamasaki Masashi, Okada Masahiro

SPIE Medical Imaging  2017.2 

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  2017.2 

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  2016.12 

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  2016.12 

シミュレーションコードEGS5を用いた137Csと60Coのγ線に対する小型OSL線量計の角度依存性の評価

沖野 啓樹, 浅原 孝, 三原 由樹, 林 裕晃, 金澤 裕樹, 岡崎 徹, 橋詰 拓弥, 小林 育夫

第44回日本放射線技術学会秋季学術大会  2016.10 

小型OSL線量計を用いた小児X線撮影における介助者被ばく実測に向けた現状と課題

林 裕晃, 三原 由樹, 淺原 孝, 紀本 夏実, 金澤 裕樹, 山田 健二, 笠井 亮佑, 岡崎 徹, 橋詰 拓弥, 小林 育夫

医用画像情報学会(MII)平成28年度秋季(第176回)大会  2016.10 

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, Okada Masahiro

Tokushima Bioscience Retreat  2016.9 

座長推薦優秀発表賞

2018.6   第45回日本放射線技術学会秋季学術大会   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