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Development of Planning Target Volume Margin Automatic Determination System

Research Project

Project/Area Number 19K16803
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 50020:Tumor diagnostics and therapeutics-related
Research InstitutionKyushu University

Principal Investigator

HIROSE Takaaki  九州大学, 大学病院, 診療放射線技師 (50608982)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
KeywordsPTVマージン / 前立腺癌 / IMRT / 治療計画体積マージン / 個別化治療計画 / 機械学習
Outline of Research at the Start

放射線治療においてIMRTの技術は標的の形状に合わせて複雑な線量分布の最適化を可能とする.しかし,そのターゲットおよびリスク臓器の形状等の解剖学的情報と線量情報の関係は明らかになっていない.本研究の目的は前立腺癌IMRTにおいて,放射線治療計画におけるCTVおよびリスク臓器の形状変化を考慮した最適なPTVマージンおよびPRVマージンについて解剖学的情報と線量情報との関係性を解明することである.その方法は,治療計画CT画像からCTVおよびリスク臓器の解剖学的情報と線量情報との関係性について機械学習を用いて解析し,個々の症例に対してPTVマージンおよびPRVマージンの個別化を試みる.

Outline of Final Research Achievements

Observer uncertainty in CBCT registration of prostate cancer IMRT was evaluated. We investigated the uncertainty of registration in IGRT using CBCT images and the PTV margin considering inter-observer variability. We compared the uncertainty of prostate centroid registration in prostate cancer IGRT by 6 radiological technologists with the prostate contours extracted by radiation oncologists on CBCT images. It was classified into random errors and evaluated. The PTV margins to be considered due to inter-observer variability in IGRT were 3.5, 3.8, and 2.1 mm in the AP, SI, and LR directions, respectively.

Academic Significance and Societal Importance of the Research Achievements

前立腺癌の画像誘導放射線治療における観察者間の変動を考慮した最適なPTVマージンの結果が得られた.PTVマージンは放射線治療の遂行にあたり,標的領域に十分な処方線量を投与するために,様々な不確かさを考慮して決定され,治療成績にも大きく寄与するものである.得られた結果は.局所腫瘍制御率の向上と正常組織障害の低減を可能とし,患者の「生活の質(Quality Of Life: QOL)」の向上に繋がる.

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2022 2020 2019

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Observer uncertainties of soft tissue‐based patient positioning in IGRT2020

    • Author(s)
      Hirose Taka‐aki、Arimura Hidetaka、Fukunaga Jun‐ichi、Ohga Saiji、Yoshitake Tadamasa、Shioyama Yoshiyuki
    • Journal Title

      Journal of Applied Clinical Medical Physics

      Volume: 21 Issue: 2 Pages: 73-81

    • DOI

      10.1002/acm2.12817

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] CBCT画像誘導 即時適応放射線治療における DIR精度評価2022

    • Author(s)
      廣瀬貴章,福永淳一,松本亮二,平野奈緒美,園田真二郎,平山亮太,長峰周治,柴山祐亮,高倉健汰
    • Organizer
      日本放射線腫瘍学会第35回学術大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] CBCTベースの適応放射線治療システム2022

    • Author(s)
      廣瀬貴章
    • Organizer
      第50回日本放射線技術学会秋季学術大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 放射線治療を支援するAI技術2022

    • Author(s)
      廣瀬貴章
    • Organizer
      第17回九州放射線医療技術大会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Uncertainties of Soft-Tissue-based Patient Registration by Multiple Observers Using Cone-beam CT for Prostate Cancer Radiation Therapy2019

    • Author(s)
      Taka-aki Hirose, Hidetaka Arimura, Junichi Fukunaga,Saiji Ohga
    • Organizer
      第117回日本医学物理学会学術大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Reveal of Uncertainties of Soft-Tissue-based Patient Registration Due to Inter- and Intra-observer Variability in IGRT Era for Prostate Cancer Radiation Therapy2019

    • Author(s)
      Taka-aki Hirose, Hidetaka Arimura, Junichi Fukunaga,Saiji Ohga
    • Organizer
      The 3rd Annual Scientific Meeting on Medical Physics and Biophysics (PIT-FMB) in conjunction with the 17th South-East Asia Congress of Medical Physics (SEACOMP)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2024-01-30  

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