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Data assimilation via fluorescence imaging

Research Project

Project/Area Number 20K21836
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 62:Applied informatics and related fields
Research InstitutionNational Institutes of Natural Sciences (2023)
Institute of Physical and Chemical Research (2020-2022)

Principal Investigator

Watabe Masaki  大学共同利用機関法人自然科学研究機構(機構直轄研究施設), 生命創成探究センター, 特任准教授 (70599480)

Project Period (FY) 2020-07-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords生物画像シミュレーション / 細胞モデリング / 光学イメージング / 細胞シミュレーション / 蛍光イメージング / データ同化 / 蛍光顕微鏡イメージング
Outline of Research at the Start

本研究では、データ同化を蛍光顕微鏡イメージングに適用して、観測できていない細胞 内領域に存在する各オルガネラの物理情報(特に、屈折率と吸光係数)の分布を再構築することを 目指す。具体的な研究計画は、主に「細胞モデルの構築」「蛍光顕微鏡シミュレーショ ン の実装」「静的なデータ同化の実装」「データ同化の評価と実蛍光画像への適用」の4部 から構成される。

Outline of Final Research Achievements

Transport of light through living cells is a complex optical phenomenon involving index refraction fluctuation and scattering (i.e., optical turbulence), treated with electromagnetic mechanical theory, classically. Ray tracing through intracellular media depends on the geometric optic effects of refractive index, transmission, and reflection, which are approximate solutions of Maxwell's equations. However, optical phenomena such as interference and diffraction of light are wave mechanical, and, in the context of intracellular optical turbulence, we expect the phase of wave functions to be significantly involved in biological cell imaging. In this study, we use the paraxial wave equation and then derive intracellular optical properties that interconnect between the phase of wave functions and optical turbulence inside cells. We then demonstrate to directly reconstruct intracellular optical parameters (e.g., refractive index and attenuation coefficient) from live cell imaging.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は、生体細胞内の光伝播の詳細なモデル化とシミュレーションにより、光の干渉や回折といった波動光学現象を解明し、細胞内の光学特性(屈折率、減衰係数など)の測定・再構築を実現した点にある。これにより、生細胞蛍光イメージングデータから、より正確な細胞内の屈折率分布や減衰係数の分布を得ることが可能となった。社会的意義としては、医療画像解析において、より高精度な細胞内観察や診断技術の向上に寄与し、病気の早期発見や新たな治療法の開発に繋がる可能性がある点が挙げられる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (4 results)

All 2023 2022

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

  • [Journal Article] Optical dispersions through intracellular inhomogeneities2023

    • Author(s)
      Masaki Watabe, Yasuhiro Hirano, Atsuko Iwane, Osamu Matoba and Koichi Takahashi
    • Journal Title

      Physical Review Research

      Volume: 5 Issue: 2

    • DOI

      10.1103/physrevresearch.5.l022043

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Optical dispersions through intracellular inhomogeneities2022

    • Author(s)
      Masaki Watabe, Yasuhiro Hirano, Atsuko Iwane, Osamu Matoba, Koichi Takahashi
    • Journal Title

      arXiv

      Volume: 2207.03137 Pages: 1-22

    • Related Report
      2022 Research-status Report
    • Open Access
  • [Presentation] 一分子蛍光イメージングにおけるコロナグラフ的解析2023

    • Author(s)
      渡部匡己
    • Organizer
      第6回「散乱透視学」領域会議
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Physical constraints to phase retrieval using the transport of intensity equation in fluorescence microscopy imaging2022

    • Author(s)
      Masaki Watabe
    • Organizer
      The 1st Conference for Sensing and Imaging Through Scattering and Fluctuating Field in Biol- ogy, Telecommunication and Astronomy (SI-Thru2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2020-08-03   Modified: 2025-01-30  

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