• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Development of a whole-body exposure reduction method using deformable neutron shielding materials for BNCT

Research Project

Project/Area Number 21K20521
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0403:Biomedical engineering and related fields
Research InstitutionOsaka Medical and Pharmaceutical University

Principal Investigator

Kakino Ryo  大阪医科薬科大学, 医学部, 特別職務担当教員(助教) (00908379)

Project Period (FY) 2021-08-30 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsホウ素中性子捕捉療法 / BNCT / 医学物理学 / 全身被曝 / 可変型中性子遮蔽材 / モンテカルロシミュレーション / 全身被ばく線量 / 放射線防護
Outline of Research at the Start

我が国では2020年6月に,切除不能な局所進行または局所再発の頭頸部癌に対する「ホウ素中性子捕捉療法(BNCT)」が保険適用となり,次世代の革新的放射線治療として期待される.BNCTは抗腫瘍効果が高い治療法である反面,照射野外に散乱される中性子フルエンスが大きい弱点がある.本研究では,患者個々に最適な形状可変中性子遮蔽材と遮蔽法を開発することで,BNCTの高い治療効果を維持しつつ全身被ばく線量を低減させることを目的とした.本手法を医療応用することにより,不要な被ばく線量を抑え,より多くの難治がん患者がBNCTの恩恵を享受できる途を拓いていく.

Outline of Final Research Achievements

Neutrons used in Boron Neutron Capture Therapy (BNCT) have the characteristic of widely scattering outside the irradiation field. This poses a particular challenge for patients with Cardiac Implantable Electronic Devices (CIEDs), as the scattered neutrons may induce device malfunctions even when the CIED is located outside the treatment area, making BNCT difficult to apply. To address this issue, we investigated and developed neutron shielding methods optimized for individual patients’ body types and positions. By using a variable shielding material, it was made possible to reduce the thermal neutron flux by approximately 40%.

Academic Significance and Societal Importance of the Research Achievements

本研究では、患者ごとの体格や治療体位に応じて最適化された遮蔽法を設計し、可変型中性子遮蔽材を用いることで、熱中性子束を約40%低減可能であることを実証した。これにより、全身被ばく線量の抑制とCIED誤作動リスクの軽減を両立させ、より多くの難治がん患者にBNCTの安全な適用を可能とする基盤技術を構築した。この成果は、BNCTの臨床適応の幅を拡げると同時に、放射線治療における個別最適化の重要性を示すものであり、今後の医療技術の発展と安全性向上に資するものである。

Report

(5 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (4 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Out‐of‐field dosimetry using a validated PHITS model and computational phantom in clinical BNCT2023

    • Author(s)
      Kakino Ryo、Hu Naonori、Tanaka Hiroki、Takeno Satoshi、Aihara Teruhito、Nihei Keiji、Ono Koji
    • Journal Title

      Medical Physics

      Volume: 51 Issue: 2 Pages: 1351-1363

    • DOI

      10.1002/mp.16916

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Comprehensive evaluation of dosimetric impact against position errors in accelerator-based BNCT under different treatment parameter settings.2022

    • Author(s)
      Kakino R, Hu N, Isohashi K, Aihara T, Nihei K, Ono K.
    • Journal Title

      Med Phys.

      Volume: 49 Issue: 8 Pages: 4944-4954

    • DOI

      10.1002/mp.15823

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Photoneutron-induced damage reduction for cardiac implantable electronic devices using neutron-shielding sheets in high-energy X-ray radiotherapy: A phantom study2021

    • Author(s)
      Kakino Ryo、Nakamura Mitsuhiro、Hu Naonori、Iramina Hiraku、Tanaka Hiroki、Sakurai Yoshinori、Mizowaki Takashi
    • Journal Title

      Physica Medica

      Volume: 89 Pages: 151-159

    • DOI

      10.1016/j.ejmp.2021.07.036

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Comprehensive evaluation of dosimetric impact against setup errors in accelerator-based BNCT with different treatment parameter settings2022

    • Author(s)
      Ryo Kakino, Naonori Hu, Kayako Isohashi, Teruhito Aihara, Keiji Nihei, Koji Ono
    • Organizer
      The 1st JSRT-JSMP Joint International Conference on Radiological Physics and Technology (ICRPT)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2021-10-22   Modified: 2026-01-16  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi