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Investigation of an innovative irradiation method for BNCT (Intensity Modulated BNCT)

Research Project

Project/Area Number 21K15793
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 52040:Radiological sciences-related
Research InstitutionOsaka Medical and Pharmaceutical University

Principal Investigator

Hu Naonori  大阪医科薬科大学, 医学部, 特別職務担当教員(講師) (90846908)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsホウ中性子捕捉療法 / 中性子フィルター / 中性子コリメータ / ホウ素中性子捕捉療法 / 深部線量向上 / 治療計画 / BNCT / Neutron / Monte Carlo simulation / Beam shaper / Collimator / Neutron filter / Thermal neutron
Outline of Research at the Start

我が国では次世代放射線治療法として期待されるBNCTのプロジェクトが進行しており、原子炉に替わり病院に設置可能な、加速器BNCTシステムが国内の複数の病院に導入されている。本研究では最適な素材、厚みのフィルターを用いて、体深部での熱中性子量を相対的に増やす手法を構想した。また、中性子ビーム射出孔(コリメータ)の全面あるいは一部をこのフィルターで覆うこと等により、深部での生成熱中性子密度に意図的な不均一を作ることも可能になる。この考案を、X線による強度変調放射線治療に似た手法(Intensity Modulated Boron Neutron Capture Therapy:IM-BNCT)へと発展させ、IMRTがX線治療を革新した如くBNCTの革新を目指す。

Outline of Final Research Achievements

The results of the experiments conducted in the 2021 fiscal year were analysed and submitted as a scientific paper to the Medical Physics journal. In the 2022 fiscal year, we succeeded in approximately doubling the intensity of neutrons and submitted this achievement to Nature's Scientific Reports. In the final year, we conducted dose calculations by combining a new neutron collimator (extended collimator), which expanded the neutron filter and collimator area optimized in 2021 and 2022. By using this extended collimator, we successfully reduced the irradiation time, which had been a challenge in 2021. We presented these research findings at the Japan-Taiwan BNCT Workshop (held in Taiwan).

Academic Significance and Societal Importance of the Research Achievements

これまで、BNCTで治療可能な深さは約6-7 cmであり、腫瘍に治療効果をもたらす前に正常な組織に許容される線量が先に到達するためである。本研究で開発した中性子フィルターは、熱中性子分布を整形できることを示しており、フィルターを患者の前に置くことで低エネルギーの熱中性子を減少させ、皮膚への線量を減少させることができる。さらに、中性子の平均エネルギーを高くさせ、より貫通力のあるビームが実現された。このフィルターを使用することで、治療可能な深さは9-10 cmに増加した。これにより、将来的にはこのフィルターを使用することで、より多くの患者がBNCTの対象となると考えている。

Report

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

    (15 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (12 results) (of which Int'l Joint Research: 7 results,  Invited: 4 results)

  • [Journal Article] Design of a filtration system to improve the dose distribution of an accelerator‐based neutron capture therapy system2022

    • Author(s)
      Hu Naonori、Tanaka Hiroki、Ono Koji
    • Journal Title

      Medical Physics

      Volume: 49 Issue: 10 Pages: 6609-6621

    • DOI

      10.1002/mp.15864

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Improvement in the neutron beam collimation for application in boron neutron capture therapy of the head and neck region2022

    • Author(s)
      Hu Naonori、Tanaka Hiroki、Kakino Ryo、Yoshikawa Syuushi、Miyao Mamoru、Akita Kazuhiko、Aihara Teruhito、Nihei Keiji、Ono Koji
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1

    • DOI

      10.1038/s41598-022-17974-7

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Evaluation of a treatment planning system developed for clinical boron neutron capture therapy and validation against an independent Monte Carlo dose calculation system2021

    • Author(s)
      Hu Naonori, Tanaka Hiroki, Kakino Ryo, Yoshikawa Syuushi, Miyao Mamoru, Akita Kazuhiko, Isohashi Kayako, Aihara Teruhito, Nihei Keiji, Ono Koji
    • Journal Title

      Radiation Oncology

      Volume: 16 Issue: 1 Pages: 243-243

    • DOI

      10.1186/s13014-021-01968-2

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Advancement in the Beam Collimation of an Accelerator-Based Neutron Source for better quality2023

    • Author(s)
      Naonori Hu
    • Organizer
      4th Japan-Taiwan Neutron Capture Therapy Academic Conference of Elites
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Advancement in the neutron beam collimation for an accelerator based neutron source for application in clinical boron neutron capture therapy2023

    • Author(s)
      Naonori Hu
    • Organizer
      American Association of Physicists in Medicine Annual Meeting
    • Related Report
      2023 Annual Research Report
  • [Presentation] Implementation of a beam shaping system designed for an accelerator-based BNCT system optimised for head and neck cancer2023

    • Author(s)
      Naonori Hu
    • Organizer
      61st Annual Particle Therapy Co-Operative Group Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Compact accelerator based epithermal neutron source and its application for cancer therapy2022

    • Author(s)
      Naonori Hu
    • Organizer
      23rd International Conference on Cyclotrons and their Applications
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Commissioning of the world's first clinical BNCT treatment planning system and validation against an independent Monte Carlo dose calculation system2022

    • Author(s)
      Naonori Hu, Hiroki Tanaka, Ryo Kakino, Syuushi Yoshikawa, Mamoru Miyao, Kazuhiko Akita, Kayako Isohashi, Teruhito Aihara, Keiji Nihei, Koji Ono
    • Organizer
      IUPESM World Congress on Medical Physics and Biomedical Engineering
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Clinical application of a conical neutron beam collimation system for accelerator based BNCT2022

    • Author(s)
      Naonori Hu, Hiroki Tanaka, Ryo Kakino, Syuushi Yoshikawa, Mamoru Miyao, Kazuhiko Akita, Kayako Isohashi, Teruhito Aihara, Keiji Nihei, Koji Ono
    • Organizer
      第35回日本放射線腫瘍学術大会
    • Related Report
      2022 Research-status Report
  • [Presentation] BNCTの線量評価 X線との違い2022

    • Author(s)
      呼尚徳
    • Organizer
      第23回放射線腫瘍学夏季セミナー
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Design, verification, and application of a filtration system to improve the dose distribution of an accelerator-based neutron capture therapy system2022

    • Author(s)
      Naonori Hu, Hiroki Tanaka, Ryo Kakino, Syuushi Yoshikawa, Mamoru Miyao, Kazuhiko Akita, Kayako Isohashi, Teruhito Aihara, Keiji Nihei, Koji Ono
    • Organizer
      第123回日本医学物理学会学術大会
    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Development of a conical neutron beam collimation system for application in accelerator based neutron source for head and neck BNCT2022

    • Author(s)
      Naonori Hu, Hiroki Tanaka, Ryo Kakino, Syuushi Yoshikawa, Mamoru Miyao, Kazuhiko Akita, Kayako Isohashi, Teruhito Aihara, Keiji Nihei, Koji Ono
    • Organizer
      第124回日本医学物理学会学術大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Accelerator based epithermal neutron source for clinical boron neutron capture therapy2022

    • Author(s)
      Naonori Hu
    • Organizer
      Union for Compact Accelerator-driven Neutron Source international symposium
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Commissioning of a treatment planning system used for clinical BNCT and validation against an independent Monte Carlo dose calculation system2022

    • Author(s)
      Naonori Hu, Hiroki Tanaka, Ryo Kakino, Syuushi Yoshikawa, Mamoru Miyao, Kazuhiko Akita, Kayako Isohashi, Teruhito Aihara, Keiji Nihei, Koji Ono
    • Organizer
      第123回日本医学物理学会学術大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Design of a filtration system to improve the dose distribution for an accelerator-based BNCT2021

    • Author(s)
      Naonori Hu, Hiroki Tanaka, Koji Ono
    • Organizer
      International Congress on Neutron Capture Therapy
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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