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Estimation of optical properties in biological tissue using time-resolved spectroscopy with femtosecond laser

Research Project

Project/Area Number 17H02081
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Biomedical engineering/Biomaterial science and engineering
Research InstitutionHamamatsu University School of Medicine

Principal Investigator

Hoshi Yoko  浜松医科大学, 光尖端医学教育研究センター, 教授 (50332383)

Co-Investigator(Kenkyū-buntansha) 谷川 ゆかり  国立研究開発法人産業技術総合研究所, 情報・人間工学領域, 研究部門付 (20344202)
清水 広介  浜松医科大学, 光尖端医学教育研究センター, 准教授 (30423841)
岡田 英史  慶應義塾大学, 理工学部(矢上), 教授 (40221840)
町田 学  浜松医科大学, 光尖端医学教育研究センター, 指定講師 (40396916)
川口 拓之  国立研究開発法人産業技術総合研究所, 情報・人間工学領域, 主任研究員 (60510394)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
Fiscal Year 2017: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Keywords生体内光伝播 / 吸収係数 / 換算散乱係数 / 脳組織 / 拡散光トモグラフィ / 生物物理 / 生物・生体工学 / 散乱係数
Outline of Final Research Achievements

Diffuse optical tomography (DOT), one of the most sophisticated optical imaging techniques for observations through biological tissue, provides functional and anatomical information. DOT image reconstruction algorithm essentially consists of the forward and inverse problems. Tissue optical properties, absorption and reduced scattering coefficients, are crucial for modeling light propagation in biological tissue (the forward problem) and guessing initial values in the inverse problem, whereas these values remain unknown in detail due to difficulties in the experimental determination and significant variations in tissue constitution. The aim of this study was in situ separate estimation of the optical properties of the gray and white matter in the brain tissue. We employed the femtosecond time-resolved spectroscopy system to measure the brain tissues of living rats and a monkey, estimating the optical properties by using a look-up table created by the Monte Carlo method.

Academic Significance and Societal Importance of the Research Achievements

近年、X線CT、MRI、PET、USなど画像診断技術の進歩は目覚ましく、診療には欠くことができない検査法である。しかし、乳幼児では薬による鎮静化が必用で、誰にでも簡単に行える検査ではない。また、神経刺激装置装着者はMRI検査を受けられないなど、計測原理に関連した制約から検査適応外の患者は多数存在する。一方、USはベッドサイドでの計測は可能であるが脳計測や機能情報を得ることは困難である。そのため、DOTは第5の画像診断法として期待されているが、光学特性値の真値が不明であることが技術開発のボトルネックの一つとなっている。本研究は、この問題を解決してDOTの実用化を加速するものである。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (22 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (7 results) Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (10 results) (of which Int'l Joint Research: 2 results,  Invited: 10 results) Remarks (1 results)

  • [Int'l Joint Research] Physikalisch-Techniche Bundesanstalt(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Ecole Centrale de Marseille(フランス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Physikalisch-Techniche Bundesanstalt(ドイツ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Politecnico de Milano(イタリア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Physikalisch-Techniche Bundesanstalt(ドイツ)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Politecnico di Milano(イタリア)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Ecole Centrale de Marseille(フランス)

    • Related Report
      2017 Annual Research Report
  • [Journal Article] In situ estimation of optical properties of rat and monkey brains using femtosecond time-resolved measurements.2019

    • Author(s)
      Hoshi Y, Tanikawa Y, Okada E, Kawaguchi H, Shimizu K, Nemoto M, Kodama T, Watanabe M.
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1 Pages: 9165-9165

    • DOI

      10.1038/s41598-019-45736-5

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A hybrid inversion scheme combining Marcov Chain Monte Carlo and iterative methods for determining optical properties of random media.2019

    • Author(s)
      Jiang Y, Hoshi Y, Nakamura G, Machida M
    • Journal Title

      Applied Sciences

      Volume: 9 Issue: 17 Pages: 3500-3500

    • DOI

      10.3390/app9173500

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 近赤外光イメージングによる脳機能計測2019

    • Author(s)
      星詳子
    • Journal Title

      OPTRONICS

      Volume: 447 Pages: 69-74

    • Related Report
      2017 Annual Research Report
  • [Journal Article] Modeling of light propagation in the human neck for diagnoses of thyroid cancers by diffuse optical tomography2017

    • Author(s)
      Fujii Hiroyuki、Yamada Yukio、Kobayashi Kazumichi、Watanabe Masao、Hoshi Yoko
    • Journal Title

      International Journal for Numerical Methods in Biomedical Engineering

      Volume: 33 Issue: 5 Pages: 591-604

    • DOI

      10.1002/cnm.2826

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Peer Reviewed
  • [Presentation] 光輸送トモグラフィ ~ 拡散光トモグラフィを越える生体情報抽出アプローチ.2020

    • Author(s)
      星 詳子
    • Organizer
      レーザー学会学術講演会第40回年次大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Developments towards diagnostic optical imaging.2019

    • Author(s)
      Hoshi Y
    • Organizer
      The 21th Takayanagi Kenjiro Memorial Symposium.
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 拡散光トモグラフィから"光輸送トモグラフィ"へ2019

    • Author(s)
      星 詳子
    • Organizer
      理研シンポジウム 第7回「光量子工学研究」
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 拡散光トモグラフィ開発:ボトルネックと展望2019

    • Author(s)
      星 詳子
    • Organizer
      第35回近赤外フォーラム
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 拡散光トモグラフィ:基礎と展望2019

    • Author(s)
      星 詳子
    • Organizer
      第26回医用近赤外線分光法研究会・第23回酸素ダイナミクス研究会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Numerical modeling of light propagation and image reconstruction in diffuse optical tomography.2019

    • Author(s)
      Yoko Hoshi
    • Organizer
      International Workshop on Tomography and Inverse Problem
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Towards next generation diffuse optical tomography: the issue of internal refractive index variations.2018

    • Author(s)
      Yoko Hoshi
    • Organizer
      Tianyuan Workshop on Mathematical and Computational Challenges of Medical Imaging and Inverse Problem.
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] タイムドメイン拡散光トモグラフィーの課題と展望 .2018

    • Author(s)
      星詳子
    • Organizer
      第37回日本医用画像工学大会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] タイムドメイン拡散光トモグラフィーの課題と展望2018

    • Author(s)
      星詳子
    • Organizer
      第37回日本医用画像工学大会
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] 拡散光トモグラフィーによるヒト生体機能イメージング.2018

    • Author(s)
      星詳子
    • Organizer
      Optical & Photonics Japan (OPJ 2018)
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Remarks] 浜松医科大学 生体医用光学研究室

    • URL

      http://www2.hama-med.ac.jp/w3a/photon/biomed/

    • Related Report
      2019 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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