• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Study of interference of the radiative transfer induced by local and global structures of biological tissues and development of theoretical calculations of the light scattering properties

Research Project

Project/Area Number 18K13694
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 19020:Thermal engineering-related
Research InstitutionHokkaido University

Principal Investigator

Fujii Hiroyuki  北海道大学, 工学研究院, 助教 (00632580)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Discontinued (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords生体内光伝播 / ふく射輸送理論 / 光学特性値 / 近赤外光イメージング / 干渉効果 / 電磁波散乱理論 / 光の干渉効果 / ふく射場の干渉機構 / 生体の大域・局所構造 / 干渉散乱理論 / ふく射輸送方程式 / 光イメージングと光治療
Outline of Final Research Achievements

This study considered dense colloidal suspensions in water as optical phantoms of biological tissues, and examined the light scattering properties in the colloidal suspensions by numerical calculations for the electromagnetic scattering and radiative transfer theories, and by light reflectance measurements based on the time-correlated single photon counting system. Especially, we investigated the light interference effects on the scattering properties in the suspensions at different volume fractions from 0.1 to 20%. We developed a theory of the interference effects in polydisperse systems based on the electromagnetic theory, while a conventional theory of the interference effects can not fully treat the polydispersity. Our numerical calculations showed conditions where the interference strongly influences the scattering properties. Time-resolved light reflectance measurements supported our numerical results.

Academic Significance and Societal Importance of the Research Achievements

近赤外の波長帯域の光を用いた生体深部イメージングや治療において、生体内にどのように光が伝播しているのか予測することが重要である。光伝播の理解のためには、光の散乱や吸収を定量化する光学特性値(散乱特性と吸収特性)を、生体の各部位にて高精度に算出する必要がある。基礎研究として、生体模擬溶液である高密度なコロイド水溶液の光散乱特性を調べることが重要である。本研究では、従来考慮されていなかった粒径分布を考慮したふく射の干渉効果に関する理論を構築し、粒径分布による散乱特性への影響について明らかにした。本研究の成果は、散乱光を用いた生体深部イメージングの開発において有用な知見である。

Report

(3 results)
  • 2020 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Research-status Report
  • Research Products

    (29 results)

All 2020 2019 2018 Other

All Int'l Joint Research (1 results) Journal Article (9 results) (of which Peer Reviewed: 8 results,  Open Access: 1 results) Presentation (14 results) (of which Int'l Joint Research: 7 results,  Invited: 2 results) Remarks (5 results)

  • [Int'l Joint Research] University of Michigan(米国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Characteristic Length and Time Scales of the Highly Forward Scattering of Photons in Random Media2020

    • Author(s)
      Hiroyuki Fujii, Moegi Ueno, Kazumichi Kobayashi, Masao Watanabe
    • Journal Title

      Applied Sciences

      Volume: 10 Issue: 1 Pages: 1-16

    • DOI

      10.3390/app10010093

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Numerical study on light propagation in a white bread loaf2020

    • Author(s)
      Hiroyuki Fujii, Goro Nishimura, Shigeki Endo, Koki Nomura, Kazumichi Kobayashi, Masao Watanabe
    • Journal Title

      Proceeding of the 7th Asian NIR symposium (ANS2020)

      Volume: AFI-0007 Pages: 14-15

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Finite element investigation of light propagationin the human neck using the time-dependent radiative transfer theory2020

    • Author(s)
      Shigeki Endo, Hiroyuki Fujii, Kazumichi Kobayashi, Masao Watanabe
    • Journal Title

      Proceeding of the 7th Asian NIR symposium (ANS2020)

      Volume: NRT-0008 Pages: 60-61

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Analysis of interference effects on light scattering in colloidal suspensions2020

    • Author(s)
      Koki Nomura, Hiroyuki Fujii, Kazumichi Kobayashi, Masao Watanabe, Goro Nishimura
    • Journal Title

      Proceeding of the 7th Asian NIR symposium (ANS2020)

      Volume: AFI-0007 Pages: 12-13

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Numerical treatment of highly forward scattering on radiative transfer using the delta-M approximation and Galerkin quadrature method2019

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

      Proceedings of the 9th International Symposium on Radiative Transfer, RAD-19

      Volume: SM05 Pages: 261-268

    • DOI

      10.1615/rad-19.320

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Light propagation models of the human neck for photoacoustic imaging of thyroid cancer2019

    • Author(s)
      Kosuke Tabayashi, Hiroyuki Fujii, Shinpei Okawa, Kazumichi Kobayashi, Yukio Yamada, Yoko Hoshi, Masao Watanabe
    • Journal Title

      CMBE Proceedings (6th International Conference on Computational & Mathematical Biomedical Engineering)

      Volume: A5 Pages: 161-164

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Numerical errors of light propagation in the two-dimensional human neck model using the time-dependent radiative transfer equation with renormalized phase functions2019

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

      AIP Conference Proceedings of ICNAAM 2018

      Volume: 印刷中

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Finite element investigation of a void region on light propagation in scattering media using the radiative transfer equation2019

    • Author(s)
      Kosuke Tabayashi, Hiroyuki Fujii, Kazumichi Kobayashi, Masao Watanabe
    • Journal Title

      AIP Conference Proceedings of ICNAAM 2018

      Volume: 印刷中

    • Related Report
      2018 Research-status Report
  • [Journal Article] Accurate and efficient computation of the 3D radiative transfer equation in highly forward-peaked scattering media using a renormalization approach2018

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

      Journal of Computational Physics

      Volume: 374 Pages: 591-604

    • DOI

      10.1016/j.jcp.2018.07.047

    • NAID

      120006939399

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Finite element investigation of light propagationin the human neck using the time-dependent radiative transfer theory2020

    • Author(s)
      Shigeki Endo, Hiroyuki Fujii, Kazumichi Kobayashi, Masao Watanabe
    • Organizer
      7th Asian NIR symposium (ANS2020)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Analysis of interference effects on light scattering in colloidal suspensions2020

    • Author(s)
      Koki Nomura, Hiroyuki Fujii, Kazumichi Kobayashi, Masao Watanabe, Goro Nishimura
    • Organizer
      7th Asian NIR symposium (ANS2020)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical study on light propagation in a white bread loaf2020

    • Author(s)
      Hiroyuki Fujii, Goro Nishimura, Shigeki Endo, Koki Nomura, Kazumichi Kobayashi, Masao Watanabe
    • Organizer
      7th Asian NIR symposium (ANS2020)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 生体部位における光伝播の解析: 散乱光を用いたイメージングへの応用に向けて2019

    • Author(s)
      藤井宏之,山田幸生,星詳子,千葉豪,西村吾朗,小林一道,渡部正夫
    • Organizer
      第56回日本生化学会北海道支部支部例会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 近赤外光による果物・食品内部物性値の非破壊評価2019

    • Author(s)
      藤井宏之
    • Organizer
      北海道大学ロバスト農林水産工学国際連携研究教育拠点 食品オープン勉強会「食品センサーと高付加価値化処理」
    • Related Report
      2019 Annual Research Report
  • [Presentation] ランダムメディアにおける光学特性値算出のための光伝播モデル2019

    • Author(s)
      上野 萌黄, 藤井 宏之, 小林 一道, 渡部 正夫
    • Organizer
      熱工学コンファレンス2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 輻射輸送論に基づいたヒト頸部内光輸送の数値解析2019

    • Author(s)
      遠藤 茂樹, 藤井 宏之, 小林 一道, 渡部 正夫
    • Organizer
      熱工学コンファレンス2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 干渉散乱理論に基づいたコロイド溶液における光伝播解析2019

    • Author(s)
      野村 航希, 藤井 宏之, 小林 一道, 渡部 正夫, 西村 吾朗
    • Organizer
      熱工学コンファレンス2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] Light propagation models of the human neck for photoacoustic imaging of thyroid cancer2019

    • Author(s)
      Kosuke Tabayashi, Hiroyuki Fujii, Shinpei Okawa, Kazumichi Kobayashi, Yukio Yamada, Yoko Hoshi, Masao Watanabe
    • Organizer
      6th International Conference on Computational & Mathematical Biomedical Engineering
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical treatment of highly forward scattering on radiative transfer using the delta-M approximation and Galerkin quadrature method2019

    • Author(s)
      Hiroyuki Fujii, Go Chiba, Yukio Yamada, Yoko Hoshi, Kazumichi Kobayashi, Masao Watanabe
    • Organizer
      9th International Symposium on Radiative Transfer, RAD-19
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 光CTによる甲状腺腫瘍診断のための ヒト頸部内光伝播の数値解析2018

    • Author(s)
      藤井宏之,山田幸生,星詳子,小林一道,渡部正夫
    • Organizer
      第40回日本光医学・光生物学会
    • Related Report
      2018 Research-status Report
  • [Presentation] Numerical study of light scattering in the human neck for diagnosis of thyroid cancers by optical tomography2018

    • Author(s)
      Hiroyuki Fujii, Yukio Yamada, Yoko Hoshi, Kazumichi Kobayashi, Masao Watanabe
    • Organizer
      12th International Conference on Complex Medical Engineering (CME2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 生体における光の輸送現象: 輻射輸送方程式の数値計算と光トモグラフィへの応用に向けて2018

    • Author(s)
      藤井宏之
    • Organizer
      2018年度 第50回炉物理夏期セミナー
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Light propagation model of biological tissues and agricultural products for evaluations of the optical properties2018

    • Author(s)
      Hiroyuki Fujii, Goro Nishimura, Go Chiba, Kazumichi Kobayashi, Masao Watanabe
    • Organizer
      The 8th Academic Exchange for Collaborative Research Between ETHZ and Hokkaido University (AECoR8)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Remarks] Researchmap

    • URL

      https://researchmap.jp/fujii-hr/

    • Related Report
      2019 Annual Research Report
  • [Remarks] 所属研究室Web page

    • URL

      https://labs.eng.hokudai.ac.jp/labo/fluid/

    • Related Report
      2019 Annual Research Report
  • [Remarks] research map

    • URL

      https://researchmap.jp/fujii-hr/?lang=japanese

    • Related Report
      2018 Research-status Report
  • [Remarks] google scholar

    • URL

      https://scholar.google.com/citations?user=eS4DaEsAAAAJ&hl=ja

    • Related Report
      2018 Research-status Report
  • [Remarks] 所属研究室web page

    • URL

      http://labs.eng.hokudai.ac.jp/labo/fluid/%e8%ab%96%e6%96%87%e3%83%bb%e7%99%ba%e8%a1%a8/

    • Related Report
      2018 Research-status Report

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi