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Quantitative Mapping of Electromagnetic Properties of Biological Tissues Using MRI

Research Project

Project/Area Number 21K20424
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0302:Electrical and electronic engineering and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

FUSHIMI Motofumi  東京大学, 大学院工学系研究科(工学部), 特任助教 (50907938)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsMRI / 導電率 / 誘電率 / 逆問題 / 定量画像化 / 磁化率
Outline of Research at the Start

生体組織の導電率・誘電率や磁化率は病変の有無や進行度を反映するバイオマーカーであり、その分布情報を画像化することで病変の特定や早期診断に役立つ。これまでにMRIデータから電磁気特性を再構成する数理手法開発に取り組んできたが、臨床応用に向けた実用性向上のためには、撮像時間の短縮やSN比の向上といった計測手法の改善が必要である。また、通常独立した導電率・誘電率・磁化率再構成のための撮像を統合することで、患者の負担を増やさずに多角的な診断が可能となる。本研究では、新規MRI撮像シーケンスの開発により画像再構成から計測までが一体となった「包括的な電磁気特性画像化モダリティの構築」を行う。

Outline of Final Research Achievements

This study aims at mapping the distribution of electrical properties (conductivity and permittivity) and magnetic properties (susceptibility) of biological tissues based on MRI measurements, which are useful for diagnosing lesion sites and evaluating biological heating. Throughout the research period, we worked on sequence optimization and winding design of the receiving coils using inverse problem analysis techniques. We created a prototype coil based on the designed winding shape and connected it to an MRI device to perform phantom imaging. By developing measurement techniques that complement the mathematical methods that have been developed, we were able to improve the practicality of the entire modality.

Academic Significance and Societal Importance of the Research Achievements

生体組織の導電率・誘電率や磁化率は病変の有無や進行度を反映するバイオマーカーの役割を果たし、その分布情報を画像化することでがんや神経変性疾患といった病変の特定や早期診断に役立つ。これまでにMRI磁場データから電磁気特性を再構成する数理手法開発に取り組んできた。しかしながら、臨床応用に向けた実用性向上のためには、MRI計測部分での撮像時間短縮やSN比の向上が必要不可欠である。本研究では、MRIの撮像シーケンス開発および受信コイルの最適化を行うことで上記の目的を達成し、これまでの画像再構成から新たに計測までが一体となった、包括的な「電磁気特性画像化モダリティの開発」を進めることができた。

Report

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

    (5 results)

All 2023 2022

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

  • [Journal Article] A novel reconstruction method for magnetic resonance elastography based on the Helmholtz decomposition2022

    • Author(s)
      Fushimi Motofumi、Nara Takaaki
    • Journal Title

      Measurement: Sensors

      Volume: 24 Pages: 100539-100539

    • DOI

      10.1016/j.measen.2022.100539

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Method for Electrical Property Tomography Based on a Three-Dimensional Integral Representation of the Electric Field2022

    • Author(s)
      Eda Naohiro、Fushimi Motofumi、Hasegawa Keisuke、Nara Takaaki
    • Journal Title

      IEEE Transactions on Medical Imaging

      Volume: 1 Issue: 6 Pages: 1-1

    • DOI

      10.1109/tmi.2021.3139455

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Optimization Of Receive Coil Shape For Highly Sensitive MRI In Deep Local Region2023

    • Author(s)
      Masaharu Takahashi, Motofumi Fushimi, Shin Yabukami, Masaki Sekino, Akihiro Kuwahata
    • Organizer
      INTERMAG 2023
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 深部局所領域に感度を持つMRI受信コイル形状の最適化2022

    • Author(s)
      高橋雅治、伏見幹史、薮上信、関野正樹、桑波田晃弘
    • Organizer
      東北大学スピニクス特別研究会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Magnetic Resonance-Based Specific Absorption Rate Estimation via Electrical Properties Tomography at 7 T2022

    • Author(s)
      Motofumi Fushimi and Masaki Sekino
    • Organizer
      BioEM 2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-10-22   Modified: 2024-01-30  

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