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Development of therapeutic dose monitors for BNCT with ultra-high peak-to-background ratios

Research Project

Project/Area Number 20H00656
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 90:Biomedical engineering and related fields
Research InstitutionTohoku University

Principal Investigator

Hitomi Keitaro  東北大学, 工学研究科, 准教授 (60382660)

Co-Investigator(Kenkyū-buntansha) 野上 光博  東北大学, 工学研究科, 助手 (10847304)
小野寺 敏幸  東北工業大学, 工学部, 准教授 (10620916)
渡辺 賢一  九州大学, 工学研究院, 教授 (30324461)
田中 浩基  京都大学, 複合原子力科学研究所, 教授 (70391274)
石井 慶造  東北大学, サイクロトロン・ラジオアイソトープセンター, 研究教授 (00134065)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥44,980,000 (Direct Cost: ¥34,600,000、Indirect Cost: ¥10,380,000)
Fiscal Year 2023: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Fiscal Year 2022: ¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
Fiscal Year 2021: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
Fiscal Year 2020: ¥13,910,000 (Direct Cost: ¥10,700,000、Indirect Cost: ¥3,210,000)
Keywordsホウ素中性子捕捉療法 / 臭化タリウム / 半導体検出器 / ガンマ線 / 結晶成長 / ホウ素中性子補足療法
Outline of Research at the Start

ホウ素中性子捕捉療法(BNCT)はガン細胞を選択的に殺傷する治療法である。しかし、治療線量のモニタリングができない事が課題である。ホウ素が中性子と反応する際に放出される478 keVの即発ガンマ線を検出して治療線量を評価する手法が提案されている。しかし、478 keVのガンマ線を高いピーク対バックグラウンド比で計測できる実用的な検出器が存在しない。本研究ではガンマ線ピーク効率が非常に高い臭化タリウム(TlBr)半導体検出器を用いてBNCT用治療線量モニターの実現を目指す。

Outline of Final Research Achievements

Boron Neutron Capture Therapy (BNCT) has gained attention as a treatment method that selectively destroys cancer. By measuring the prompt gamma rays during BNCT treatment, it is possible to monitor the therapeutic dose. In this study, gamma-ray detectors were developed using a compound semiconductor, thallium bromide (TlBr), which has high gamma-ray stopping power. Therapeutic dose monitors for BNCT were developed using the TlBr detectors. In this study, the imaging of prompt gamma rays of 478 keV originating from boron using the TlBr detector was achieved for the first time in the world.

Academic Significance and Societal Importance of the Research Achievements

本研究ではTlBr検出器を用いたBNCT用治療線量モニターの原理実証に成功した。これはバックグランドにより困難であった478 keVの即発ガンマ線の検出に新しい手法を開発したという点で学術的意義が大きい。また、本研究の成果を展開することにより実用的なBNCT用治療線量モニターの実現が期待できるため社会的意義も大きい。さらに本研究の成果は医学、工学、物理学などのガンマ線計測応用に広く利用できるため、学術的、社会的意義が大きいと結論できる。

Report

(7 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Comments on the Screening Results   Annual Research Report
  • Products Report
  • Research Products

    (26 results)

All 2024 2023 2022 2021 2020

All Journal Article (9 results) (of which Peer Reviewed: 9 results,  Open Access: 8 results) Presentation (17 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results)

  • [Journal Article] Characterization of Plasma-etched Surfaces of TlBr Crystals for Radiation Detectors2024

    • Author(s)
      Nojima Taro、Nogami Mitsuhiro、Onodera Toshiyuki、Hitomi Keitaro
    • Journal Title

      Sensors and Materials

      Volume: 36 Issue: 1 Pages: 269

    • DOI

      10.18494/SAM4703

    • ISSN
      0914-4935, 2435-0869
    • Year and Date
      2024-01-26
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Recombination Dynamics of Electron–Hole Pairs in TlBr Crystals Probed by Transient Absorption Spectroscopy Using Pulsed Electron Beams2024

    • Author(s)
      Koshimizu Masanori、Muroya Yusa、Nogami Mitsuhiro、Hitomi Keitaro
    • Journal Title

      Sensors and Materials

      Volume: 36 Issue: 1 Pages: 261

    • DOI

      10.18494/SAM4694

    • ISSN
      0914-4935, 2435-0869
    • Year and Date
      2024-01-26
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effective Volume of TlBr Semiconductor Detector2024

    • Author(s)
      Hasegawa Sota、Watanabe Kenichi、Sugai Yusuke、Nogami Mitsuhiro、Hitomi Keitaro
    • Journal Title

      Sensors and Materials

      Volume: 36 Issue: 1 Pages: 163

    • DOI

      10.18494/SAM4632

    • ISSN
      0914-4935, 2435-0869
    • Year and Date
      2024-01-26
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of Time-of-flight Measurement System for Carrier Transport Characterization of TlBr Semiconductor Detectors2024

    • Author(s)
      Sugai Yusuke、Watanabe Kenichi、Hasegawa Sota、Hitomi Keitaro、Nogami Mitsuhiro
    • Journal Title

      Sensors and Materials

      Volume: 36 Issue: 1 Pages: 155

    • DOI

      10.18494/SAM4631

    • ISSN
      0914-4935, 2435-0869
    • Year and Date
      2024-01-26
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Comparison Between Neutron Bragg Dip and Electron Backscatter Diffraction Images of TlBr Semiconductors2024

    • Author(s)
      Watanabe Kenichi、Sugai Yusuke、Hasegawa Sota、Hitomi Keitaro、Nogami Mitsuhiro、Shinohara Takenao、Su Yuhua、Parker Joseph Don、Kockelmann Winfried
    • Journal Title

      Sensors and Materials

      Volume: 36 Issue: 1 Pages: 149

    • DOI

      10.18494/SAM4629

    • ISSN
      0914-4935, 2435-0869
    • Year and Date
      2024-01-26
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Compton Imaging Using Pixelated TlBr Semiconductor Detector2024

    • Author(s)
      Hitomi Keitaro、Matsumura Motohiro、Watanabe Kenichi、Maruyama Shusuke、Nogami Mitsuhiro、Akira Uritani
    • Journal Title

      Sensors and Materials

      Volume: 36 Issue: 1 Pages: 225

    • DOI

      10.18494/SAM4672

    • ISSN
      0914-4935, 2435-0869
    • Year and Date
      2024-01-26
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characterization of long-term stability of thallium bromide detectors2024

    • Author(s)
      Mitsuhiro Nogami, Kenichi Watanabe, Keitaro Hitomi
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 63 Issue: 9 Pages: 096002-096002

    • DOI

      10.35848/1347-4065/ad7803

    • Related Report
      Products Report
    • Peer Reviewed / Open Access
  • [Journal Article] Reversible capacitive Frisch grid TlBr detectors2023

    • Author(s)
      Nogami Mitsuhiro、Hitomi Keitaro、Onodera Toshiyuki、Watanabe Kenichi、Ishii Keizo
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: 9 Pages: 096501-096501

    • DOI

      10.35848/1347-4065/acf0aa

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Characterization of coincidence time resolutions of TlBr x Cl 1-x crystals as Cherenkov radiators2023

    • Author(s)
      Hitomi Keitaro、Kim Cheonghun、Nogami Mitsuhiro、Shimazoe Kenji、Takahashi Hiroyuki
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: 8 Pages: 081001-081001

    • DOI

      10.35848/1347-4065/ace5fa

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] TlBr半導体の結晶性および二次元キャリア輸送特性の比較2024

    • Author(s)
      須貝 優介、長谷川 創大、渡辺 賢一、人見 啓太朗、野上 光博
    • Organizer
      第71回応用物理学会春季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Characterization of Thallium Bromide Gamma-Ray Detectors for Boron Neutron Capture Therapy2023

    • Author(s)
      K. Hitomi, M. Nogami, K. Watanabe, T. Onodera, H. Tanaka, K. Ishii
    • Organizer
      2023 IEEE Nuclear Science Symposium, Medical Imaging Conference, and Room-Temperature Semiconductor Detector Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study on conditioning effect of TlBr semiconductor detectors with gold electrodes2023

    • Author(s)
      S. Hasegawa, K. Watanabe, K. Hitomi, M. Nogami, Y. Sugai
    • Organizer
      2023 IEEE Nuclear Science Symposium, Medical Imaging Conference, and Room-Temperature Semiconductor Detector Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Crystal quality evaluation of a large TlBr crystal using neutron Bragg-dip imaging2023

    • Author(s)
      K. Watanabe1, S. Hasegawa, Y. Sugai, M. Nogami, K. Hitomi, S. Maeda, H. Onabe
    • Organizer
      2023 IEEE Nuclear Science Symposium, Medical Imaging Conference, and Room-Temperature Semiconductor Detector Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Analysis of Recombination Kinetics of Electron-Hole Pairs in TlBr Crystals Using Pulsed Electron Beams of Different Intensities2023

    • Author(s)
      M. Koshimizu, Y. Muroya, M. Nogami, K. Hitomi
    • Organizer
      2023 IEEE Nuclear Science Symposium, Medical Imaging Conference, and Room-Temperature Semiconductor Detector Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Radiation Sensing Using Thallium Bromide Crystals2023

    • Author(s)
      Keitaro Hitomi, Mitsuhiro Nogami
    • Organizer
      The 30th International Display Workshops
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] TlBr半導体検出器の移動度二次元分布計測システムの開発2023

    • Author(s)
      渡辺 賢一、須貝 優介、長谷川 創大、野上 光博、人見 啓太朗
    • Organizer
      日本原子力学会 2023年秋の大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] プラズマ処理したTl電極TlBr放射線検出器の初期特性評価2023

    • Author(s)
      野島 太郎、野上 光博、小野寺 敏幸、人見 啓太朗
    • Organizer
      第84回応用物理学会秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] TlBr結晶の二次元キャリア輸送特性評価システムに関する検討2023

    • Author(s)
      須貝 優介、長谷川 創大、渡辺 賢一、人見 啓太朗、野上 光博
    • Organizer
      第84回応用物理学会秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 臭化タリウム半導体検出器のコンディショニング効果の評価2023

    • Author(s)
      長谷川 創大、渡辺 賢一、須貝 優介、人見 啓太朗、野上 光博
    • Organizer
      第84回応用物理学会秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] TlBrピクセル検出器実装評価システム開発2023

    • Author(s)
      豊川 秀訓、人見 啓太朗、野上 光博、小野寺 敏幸、池田 博一、久保 信、末永 敦士、尾鍋 秀明
    • Organizer
      第84回応用物理学会秋季学術講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] TlBr検出器の連続動作特性評価2022

    • Author(s)
      人見 啓太朗、野上 光博、渡辺 賢一、前田 茂貴、小野寺 敏行、石井 慶造
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Fabrication of 2-cm Thick TlBr Detectors2022

    • Author(s)
      K. Hitomi, S. Maeda, M. Nogami, C. Ito, K. Watanabe
    • Organizer
      2022 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room Temperature Semiconductor Detector Conference
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] TlBr検出器を用いた加速器中性子による478 keV即発ガンマ線の検出2022

    • Author(s)
      人見 啓太朗、野上 光博、渡辺 賢一、小野寺 敏幸、田中 浩基、石井 慶造
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Characterization of long-term stability of thallium bromide gamma-ray detectors2021

    • Author(s)
      K. Hitomi, M. Nogami, T. Onodera, K. Watanabe, K. Ishii
    • Organizer
      The 28th International Symposium on Room-Temperature Semiconductor Detectors
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 臭化タリウム検出器を用いたBNCT基礎研究のための小動物用PG-SPECT装置の開発2021

    • Author(s)
      中村 泰基、人見 啓太朗、野上 光博、渡辺 賢一、高田 卓志、櫻井 良憲、田中 浩基
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 臭化タリウム検出器の信号波形処理に関する基礎検討2020

    • Author(s)
      椿山 邦見、渡辺 賢一、吉橋 幸子、山﨑 淳、瓜谷 章、人見 啓太朗、野上 光博
    • Organizer
      日本原子力学会中部支部 第52回研究発表会
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2025-03-27  

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