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Challenge to tumor pathology by particle beams – biological washout study using in-beam PET

Research Project

Project/Area Number 21K07608
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52040:Radiological sciences-related
Research InstitutionNational Institutes for Quantum Science and Technology (2022-2023)
Tokyo Women's Medical University (2021)

Principal Investigator

Chie Toramatsu  国立研究開発法人量子科学技術研究開発機構, 量子医科学研究所 先進核医学基盤研究部, 主幹研究員 (90421825)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords粒子線治療 / PET / 核医学 / 動態解析 / バイオマーカ / 洗い出し / MRI / 生物学的洗い出し / Theranostics / autoactivation / in beam PET / washout effect / particle therapy
Outline of Research at the Start

本研究では、粒子線と患者体内組織との核破砕反応により発生するポジトロン放出核種に着目し、治療ビームを放射性薬剤として診断に利用するという世界初の画期的な方法の実現に挑戦する。治療その場で腫瘍内部の変化を詳細に観察し、その情報に基づいて治療効果や予後を判定・予測・評価することで最適な治療を先手を打って選ぶ「見ながら治療(Theranostics)」という未来の医療の実現に向けて、小動物を用いた基礎実験を行う。

Outline of Final Research Achievements

During particle beam therapy, positron-emitting nuclides generated in the body by the nuclear fragmentation reaction of the treatment beam are mainly metabolized by the bloodstream, and the rate at which they are washed out is considered to indicate the hemodynamics of the tumor. Since the response of tumor tissue to radiation therapy is reflected in changes in blood perfusion, oxygen status, and hemodynamics, we hypothesized that the washout rate itself would be a biomarker of tumor hemodynamics, and verified this through animal experiments. As a result of conducting heavy ion beam irradiation experiments on rat tumor models, it was found that the distribution of biological washout rate could be determined depending on the vascular dynamics within the tumor. It has been suggested that PET monitoring of heavy ion radiotherapy makes it possible to determine the pathological state of tumors and treatment effects.

Academic Significance and Societal Importance of the Research Achievements

放射線治療における腫瘍組織の反応は、血液灌流や酸素状態つまり、血行動態の変化として反映されるため、治療効果の判定にはMRIやCTによる血管造影や腫瘍内の血行動態の診断が行われる 。一方、PETは粒子線治療の飛程検証法として注目されてきた。粒子線が引き起こす原子核破砕反応により、体内で発生する陽電子放出核種を可視化する原理である。
本研究成果により、生成陽電子放出核種の代謝速度は腫瘍の血行動態を示していることが示された。飛程検証のPET撮像により副次的に腫瘍血行状態も分かるようになれば、治療期間中の腫瘍病理状態をその場で検査することができ、造影剤などを用いる検査を省略できるようになるであろう。

Report

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

    (16 results)

All 2023 2022 2021

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results) Presentation (14 results) (of which Int'l Joint Research: 9 results,  Invited: 3 results)

  • [Journal Article] Tumour status prediction by means of carbon-ion beam irradiation: comparison of washout rates between in-beam PET and DCE-MRI in rats2023

    • Author(s)
      Toramatsu Chie、Mohammadi Akram、Wakizaka Hidekatsu、Nitta Nobuhiro、Ikoma Yoko、Seki Chie、Kanno Iwao、Yamaya Taiga
    • Journal Title

      Physics in Medicine and Biology

      Volume: 68 Issue: 19 Pages: 195005-195005

    • DOI

      10.1088/1361-6560/acf438

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Measurement of biological washout rates depending on tumor vascular status in 15O in-beam rat-PET2022

    • Author(s)
      Toramatsu Chie、Mohammadi Akram、Wakizaka Hidekatsu、Sudo Hitomi、Nitta Nobuhiro、Seki Chie、Kanno Iwao、Takahashi Miwako、Karasawa Kumiko、Hirano Yoshiyuki、Yamaya Taiga
    • Journal Title

      Physics in Medicine & Biology

      Volume: 67 Issue: 12 Pages: 125006-125006

    • DOI

      10.1088/1361-6560/ac72f3

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] OpenPET: a novel PET prototype for range verification ready for clinical test in HIMAC2023

    • Author(s)
      Yamaya Taiga, Tashima Hideaki, Toramatsu Chie, Akram Mohammadi, Iwao Yuma, Akamatsu Go, Hangyu Kang, Tajiri Minoru, Mizuno Hideyuki, Koto Masashi
    • Organizer
      PTCOG-AO
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Bench-to-Clinical Transfer of OpenPET: First In-Beam Test in a HIMAC Treatment Room2023

    • Author(s)
      Tashima Hideaki, Toramatsu Chie, Akram Mohammadi, Iwao Yuma, Inadama Naoko, Hangyu Kang, Akamatsu Go, Tajiri Minoru, Mizuno Hideyuki, Koto Masashi, Yamaya Taiga
    • Organizer
      IEEE NSS MIC RTSD, IEEE NPSS
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Dose estimation from in-beam PET imaging of 11C and 15O beams2023

    • Author(s)
      Akram Mohammadi, Tashima Hideaki, Takyu Sodai, Iwao Yuma, Toramatsu Chie, Nishikido Fumihiko, Katia Parodi, Yamaya Taiga
    • Organizer
      IEEE NSS MIC RTSD, IEEE NPSS
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 重粒子線治療の臨床応用に向けたOpenPET開発機のコミッショニング2023

    • Author(s)
      寅松 千枝
    • Organizer
      第126回日本医学物理学会学術大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] In situ tumour response PET imaging without radiopharmaceuticals in particle therapy: a feasibility study in rats2023

    • Author(s)
      Toramatsu Chie
    • Organizer
      European Association of Nuclear Medicine (EANM)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 重粒子線がん治療における初の臨床適用に向けたOpenPET装置開発2023

    • Author(s)
      田島 英朗, 寅松 千枝, Mohammadi Akram, 岩男 悠真, 赤松 剛, 稲玉 直子, Kang Han Gyu, 田尻 稔, 水野 秀之, 小藤 昌志, 山谷 泰賀
    • Organizer
      第42回日本医用画像工学会大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Comparison of kinetics of the produced positron emitters after 12C-ion irradiation and that of the MRI contrast agents in rat tumor2023

    • Author(s)
      Toramatsu Chie
    • Organizer
      The 2nd International Conference on Radiological Physics and Technology (ICRPT)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] THE WASHOUT EFFECT IN SMALL AMIMALS : IN-BEAM OPEN-PET MEASUREMENT USING 15O AND 11C ION BEAMS2023

    • Author(s)
      Toramatsu Chie
    • Organizer
      International conferences of Mini- Micro- Nano- Dosimetry
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] BENCH-TO-CLINICAL DEVELOPMENT OF VRAIN: THE WORLD FIRST BRAIN-DEDICATED PET WITH A HEMISPHERICAL GEOMETRY2023

    • Author(s)
      Yamaya Taiga, Akamatsu Go, Tashima Hideaki, Iwao Yuma, Yoshida Eiji, Wakizaka Hidekatsu, Toramatsu Chie, Takahashi Miwako
    • Organizer
      International conferences of Mini- Micro- Nano- Dosimetry
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] BIOLOGICAL WASHOUT AS A BIOMARKER OF TUMOR VASCULAR STATUS IN PARTICLE THERAPY: RAT IN-BEAM PET USING 15O ION BEAM2023

    • Author(s)
      C. Toramatsu, A. Mohammadi, H. Wakizaka, C. Seki, F. Nishikido, S. Sato, I. Kanno, M Takahashi and T. Yamaya
    • Organizer
      the Mini- Micro- Nano- Dosimetry (MMND) conference 2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Comparison of kinetics of the produced positron emitters after carbon beam irradiation and that of the MRI contrast agents in rat tumor2023

    • Author(s)
      Chie Toramatsu, Akram Mohammadi, Hidekatsu Wakizaka, Hitomi Sudo, Nobuhiro Nitta, Chie Seki, Iwao Kanno, Yoko Ikoma and Taiga Yamaya
    • Organizer
      the 2nd International Conference on Radiological Physics and Technology (ICRPT)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Biological washout as a biomarker of tumor vascular status in particle therapy: in-beam tumor bearing nude rat PET study2022

    • Author(s)
      C. Toramatsu, A. Mohammadi, H. Wakizaka, C. Seki, F. Nishikido, S. Sato, I. Kanno, M Takahashi and T. Yamaya
    • Organizer
      第124回日本医学物理学会学術大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 粒子線治療ビーム照射により体内で発生する陽電子放出核の動態解析2022

    • Author(s)
      寅松 千枝、Akram Mohammadi、脇坂秀克、新田展大、関千江、菅野巌、山谷泰賀
    • Organizer
      第6回 日本核医学会・核医学理工分科会
    • Related Report
      2022 Research-status Report
  • [Presentation] Can biological washout rate be a biomarker of tumor viability in charged particle therapy? A rat in-beam PET study2021

    • Author(s)
      20.C. Toramatsu, A. Mohammadi, H. Wakizaka, C. Seki, F. Nishikido, S. Sato, I. Kanno, M Takahashi and T. Yamaya
    • Organizer
      第121回日本医学物理学会学術大会
    • Related Report
      2021 Research-status Report

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

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