Department of Medical Physics, Clinical Collaboration Unit,
Faculty of Radiological Technology, School of Medical Sciences,
Fujita Health University

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News & Topics

  • July 31, 2021
　Two of our graduates' research has been published as English papers. Congratulations!
  • April 16, 2021
　Three of our graduate students presented their research at JRC2021.
  • April 1, 2021
　We have 8 graduate students (1 doctoral student, 7 masters students) and 13 undergraduate students!

Introduction

Medical physics is a scientific subject that contributes to the appropriate implementation of medical services using radiation. It is the process of applying physics and engineering knowledge and results to medicine, and plays a major role in radiation diagnosis, radiation therapy, and other medical fields that use radiation. The medical physics group specializes physics in radiation dosimetry and radiation therapy: the resent research topics are radiation exposure for patients, occupational radiation exposure, development and clinical implementation of new detectors, optimization of deformable image registration, proton therapy and so on.

Members

Faculty members

Faculty of Radiolojical Technology

Graduate students

Doctor’s course: ICHIKAWA Takuma (D2)
Master’s course: ICHIHARA Masaya (M2), OSHIKA Riki (M2), KURATA Shun (M2), KUMAZAKI Hironari (M2), KURIMOTO Maki (M1), HORITA Masato (M1), YAMANAKA Daisuke (M1)

Undergraduate students

ASADA Lab. 5 students, HAYASHI Lab. 3 students, YASUI Lab. 5 students

Research Theme

・Research on dosimetry and dose assessment for patients

Dosimetry using a human equivalent phantom and nanoDot dosimeter

In recent years, it has been reported that medical exposure in Japan is higher than in other countries. The ICRP has recommended the application of diagnostic reference levels (DRLs) as an indicator for optimizing radiation protection. The ICRP recommends the application of the DRLs as an indicator for optimizing radiation protection.
The DRLs were first published in Japan in 2015 and revised in 2020. In preparation for the next revision, we will conduct a nationwide dose survey in general radiography and mammography to clarify the current status of doses received by patients. We are also studying the evaluation and measurement techniques (nanoDot dosimeter) for the entrance surface dose of DRL in general radiography and the glandular dose in mammography. (Yasuki Asada)

・Development of portable surface monitoring device
・Study on radiation delivery accuracy and precision
・Optimimal clinical implementation of deformable image registration

Fundamental examination for development of portable SGRT device.

In recent years, high-precision radiotherapy has become more accessible due to advances in radiotherapy equipment and treatment planning devices. In addition, image-guided radiotherapy has become widely used, and the amount of information handled during radiotherapy has increased substantially. However, in order to safely implement and further advance these technologies, research from the perspective of medical physics is required. We are carrying out research on a variety of clinically applicable topics in order to clarify hypotheses arising from trivial questions in actual clinical situations. (Naoki Hayashi)

・Proton therapy: Verification of detector response characteristics using Monte Carlo calculations.
・Dosimetry: Development of detectors using 3D printers.
・Radiation biology: Clarification of dose rate characteristics of cells

Monte Carlo simulation of proton beams

In our laboratory, we are investigating the response characteristics of detectors in proton dosimetry. We conduct Monte Carlo simulations and measurements using actual proton devices and have achieved some of the best results in the field of proton therapy in Japan.
We are also conducting research to develop new detectors by applying 3D printers. By mixing chemicals, we can create detectors that react to radiation. In addition, we have started experiments to clarify the dose rate characteristics of various cells based on the recent development of high dose rates in radiotherapy equipment. (Keisuke Yasui)

Annual Events

Article Reading Session

Faculty and graduate students present papers on the latest findings. This is held once a week as a laboratory seminar along with research meetings.

Research Meeting

Research Meeting

Graduate students' research progress is presented at this meeting. These meetings are held once a week along with paper abstracts.

Joint seminar with three universities

Joint seminar with three universities （Web）

We hold a joint seminar once a year with laboratories in the field of radiotherapy at Nagoya University and Kanazawa University. Mainly first-year master's students and fourth-year students give presentations.

Presentations at academic conferences

We have made presentations at domestic conferences such as the Japanese Society of Medical Physics and the Japanese Society of Radiation Technology, as well as at many international conferences such as the American Association of Physicists in Medicine (AAPM) and the Asia Oceania Congress of Medical Physics (AOCMP).

Recreation

We hold birthday parties, takoyaki parties, and other events that allow students and teachers to communicate with each other.

Recreation

We hold wine parties, year-end parties, sports events, etc.

Photo Gallery

  • Birthday Party

  • The laboratory

  • The experiment

  • Medical Physics Clinical Practice

  • Congratulations: passing the medical physicist certification examinations

  • Graduation Ceremony

Academic Activities

Manuscripts

2021

  • Ryo Komori, Naoki Hayashi, Tatsunori Saito, Hiroshi Amma, Yuta Muraki, Masashi Nozue: Improvement of patient localization repeatability using a light-section based optical surface guidance system in a pre-positioning procedure. Cancer Radiotherapie, In press
  • Keisuke Yasui, Yuta Omi, Akira Shimomura, Rie Muramatsu, Hiromitsu Iwata, Hiroyuki Ogino, Akari Furukawa, Naoki Hayashi; Dosimetric impact of systematic spot position errors in spot scanning proton therapy of head and neck tumor, Journal Of Cancer Research And Therapeutics, 2021 in press,
  • Yuta Omi, Keisuke Yasui, Akira Shimomura, Rie Muramatsu, Hiromitsu Iwata, Hiroyuki Ogino, Akari Furukawa, Naoki Hayashi; Dosimetric effects of quality assurance-related setup errors in passive proton therapy for prostate cancer with and without a hydrogel spacer, Radiol Phys Technol. 2021 Jul 27.
  • Nagata J, Yasui K, Omachi C, Toshiyuki T, Shimizu H, Aoyama T, Hayashi N., Evaluation of radiophotoluminescent glass dosimeter response for therapeutic spot scanning proton beam: suggestion of linear energy transfer-based correction. J Appl Clin Med Phys. 2021 Aug;22(8):265-272
  • Takumi Kodama, Keisuke Yasui, Shie Nishioka, Kazunori Miyaura, Toru Takakura, Tetsurou Katayose, Mitsuhiro Nakamura; Survey on utilization of flattening filter-free photon beams in Japan, Journal of Radiation Research, Volume 62, Issue 4, July 2021, Pages 726–734
  • Keisuke Yasui, Y. Saito, S. Ogawa, N. Hayashi; Dosimetric characterization of a new twodimensional diode detector array used for stereotactic radiosurgery quality assurance, Int. J. Radiat. Res., Vol. 19 No. 2, April 2021
  • Sakai K.,Yamada Y.,Yoshida K.,Yoshinaga S.,Sato K.,Ogata H.,Iwasaki T.,Kudo S.,Asada Y., Kawaguchi I., Haeno H., Sasaki M.; Conclusions and suggestions on low-dose and low-dose rate radiation risk estimation methodology, J. Radiat. Prot. Res. Volume 46, Issue 1, Pages 14 – 23 March 2021
  • Matsunaga Y., Haba T.,Kobayashi M.,Suzuki S.,Asada Y.,Chida K.; Fetal radiation dose of four tube voltages in abdominal CT examinations during pregnancy: A phantom study, J. Appl .Clin. Med. Phys. Open Access Volume22, Issue2, Pages178 – 184 February 2021
  • Keisuke Yasui, Chihiro Omachi, Junya Nagata, Toshiyuki Toshito, Hidetoshi Shimizu, Takahiro Aoyama, Naoki Hayashi; Dosimetric response of a glass dosimeter in proton beams: LET-dependence and correction factor, Physica Medica 81 (2021) 147–154
  • Tomonobu Haba, Keisuke Yasui, Yasunori Saito, Masanao Kobayashi, Shuji Koyama; A new cone-beam computed tomography dosimetry method providing optimal measurement positions: A Monte Carlo study, Physica Medica 81 (2021) 130–140
  • Naoki Hayashi, Hideyuki Mizuno, Shigekazu Fukuda, Medical Physics International 8(3) 426-429 2021, Janualy

2020

  • Kensuke Tani, Akihisa Wakita, Naoki Tohyama, Yukio Fujita, Satoshi Kito, Ryohei Miyasaka, Norifumi Mizuno, Ryuzo Uehara, Toru Takakura, Shunsuke Miyake, Kazuya Shinoda, Yoshitaka Oka, Yasunori Saito, Hideki Kojima, Naoki Hayashi; Evaluation of differences and dosimetric influences of beam models using golden and multi-institutional measured beam datasets in radiation treatment planning systems. Medical physics 47(11) 5852-5871 2020, November
  • Tokiko Nakamura, Shoichi Suzuki, Kyoichi Kato, Napapong Pongnapang, Naoki Hayashi, Chie Kurokawa, Ikuo Kobayashi, Toru Negishi, Tamaki Matsunami; Effect of protective glasses on radiation dose to eye lenses during whole breast irradiation Journal of Applied Clinical Medical Physics 21(11) 272-277 2020, November
  • Asada Y.,Kondo Y.,Kobayashi M.,Kobayashi K.,Ichikawa T.,Matsunaga Y.; Proposed diagnostic reference levels for general radiography and mammography in Japan, J. Radiol. Prot. Volume 40, Issue 3, Pages 867 – 876 September 2020

2019

  • Keisuke Yasui, Akira Shimomura, Toshiyuki Toshito, Kenichiro Tanaka, Kumiko Ueki, Rie Muramatsu, Masaki Katsurada, Naoki Hayashi, Hiroyuki Ogino; A quality assurance for respiratory gated proton irradiation with range modulation wheel, J Appl Clin Med Phys 2019; 20:1: 258–264
  • Keisuke Yasui, Toshiyuki Toshito, Chihiro Omachi, Kensuke Hayash, Hideto Kinou, Masaki Katsurada, Naoki Hayashi, Hiroyuki Ogino; Dosimetric verification of IMPT using a commercial heterogeneous phantom, J Appl Clin Med Phys 2019; 20:2: 114–120
  • Tomohiro Shimozato, Keisuke Yasui, Hireto Kinou, Fumiaki Komatsu; Periodic Measurements of Passive Proton Beam Width Using Radiochromic Film in Fixed Gantry System, Int. J. Medical Physics, Clinical Engineering and Radiation Oncology. 2019, 8, 193-203

Conference

2021

  • Masaya Ichihara et al, Monte Carlo calculation of beam quality correction factors for cylindrical ionization chambers in proton beams using PTSIM/Geant4, AAPM 2021
  • Riki Oshika et al, Development a portable body surface monitoring device using depth camera, AAPM 2021
  • Masaya Ichihara et al., Calculation of proton quality correction factor for scanning proton beam, Annual Meeting of the Japan Society of Radiation Technology
  • Riki Oshika et ai, Development and feasibility of a simple portable body surface monitoring device using an infrared camera in radiotherapy, General Meeting of the Japanese Society of Medical Physics （JSMP121）
  • Shun Kurata et al, Simple evaluation of the accuracy of irradiation position for single isocenter multiple target stereotactic radiotherapy, General Meeting of the Japanese Society of Medical Physics （JSMP121）

2020

  • Yasui K et al, Feasibility study of 3D-printed scintillation detector for quality assurance, 2020 Joint AAPM | COMP Meeting
  • Yasui K et alDosimetry of synchrotron-based FLASH irradiation using low-sensitivity radiochromic film, 2020 Joint AAPM | COMP Meeting
  • Junya Nagata et al, Investigation of radiophotoluminescent glass dosimeter response for a spot scanning proton beam dosimetry, 2020 Joint AAPM | COMP Meeting
  • Shuta Ogawa et al, Investigation of dose perturbations around brachytherapy seeds in high-energy photon beams, 2020 Joint AAPM | COMP Meeting
  • Kazuki Ouchi et al, Evaluation of Coordinate Coincidence among multiple image guidance systems 2020 Joint AAPM | COMP Meeting
  • Masaya Ichihara et al, Monte Carlo calculation of beam quality correction factors for cylindrical ionization chambers in proton beams using PTSIM/Geant4, AOCMP 2020

Book

Access

  • Access to Medical Physics ⇒ 5th, University Building 11

Links

Japanese Web Site