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RIKEN Baton Zone Program 3D Dosimeter Research Laboratory

Team Leader: Toshimasa Hamada
Deputy Team Leader: Yasuhiro Ishida (D.Eng.)

Research Summary

Toshimasa Hamada Yasuhiro Ishida (D.Eng.)

In radiotherapy to treat cancer, it is essential to accurately adjust irradiation position and dose in advance to avoid irradiation of healthy tissue as much as possible. Because 3D dosimeters can be made with materials and in a size compatible with the human body, and the irradiated part does not depend on the direction of radiation but responds to the radiation dose, we consider these dosimeters to be useful for evaluating and validating treatment strategies in a precise manner. We will proceed to develop novel 3D dosimeters with the objective to design a product for practical application.

[Integrated Collaborative Research with Nissan Chemical Corporation.]

Main Research Fields

  • Medicine, Dentistry & Pharmacy

Related Research Fields

  • Chemistry
  • Complex Systems
  • Medical physics and Radiological Technology
  • Medical engineering assessment


  • Radiotherapy
  • Dosimeter

Selected Publications

  • 1. Oe, A., Nemoto M., Miyazawa, M. Sahade, D. A., and Hamada, T.:
    "Spatial dose distribution analysis of Co-60 HDR brachytherapy of cervical cancer using an AQUAJOINT®-based VIPET polymer gel dosimeter"
    Journal of Physics: Conf. Series, 1305, 012052 (2019).
  • 2. Nemoto, M., Oe, A., Kotani, T., Sahade, D. A., and Hamada, T.:
    "Basic characteristics of an AQUAJOINT®-based VIPET polymer gel dosimeter"
    Journal of Physics: Conf. Series, 1305, 012042 (2019).
  • 3. Takanashi, T., and Kawamura, H.:
    “Evaluation of Spatial Resolution of MRI, Optical CT and X-Ray CT Using MTF for Gel Dosimeter”
    World Congress on Medical Physics and Biomedical Engineering, 35-38 (2018)
  • 4. Maeyama, T., Ishida Y., Kudo, Y., Fukasaku, K., Ishikawa, K. L., and Fukunishi, N.:
    “Polymer Gel Dosimeter with AQUAJOINT® as Hydrogel Matrix”
    Radiation Physics and Chemistry, 146, 121–125 (2018).
  • 5. Takanashi, T., Kawamura, H., Fukasaku, K., Sahade, D. A., and Hamada, T.:
    "A comparison of the dose–response behavior of AQUAJOINT®-based polymer gel and PAGAT gel dosimeters measured using Optical CT and MRI"
    Journal of Physics: Conf. Series, 847, 012013 (2017).

Related Links

Lab Members

Principal investigator

Toshimasa Hamada
Team Leader

Core members

Yasuhiro Ishida
Deputy Team Leader
Yoshihiro Kudo
Visiting Scientist
Mikio Nemoto
Visiting Scientist
Hiraku Kawamura
Visiting Scientist
Kazushige Fukuda
Research Part-time Worker II

Contact Information

W301, Cooperation Center
2-1, Hirosawa, Wako, Saitama
351-0198, Japan
Tel: +81-(0)48-467-1348
Fax: +81-(0)48-467-9735
Email: toshimasa.hamada [at] riken.jp