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Development of 3D acoustic CT with multi-channel phonocardiogram for lung lesion detection

Research Project

Project/Area Number 21K19880
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 90:Biomedical engineering and related fields
Research InstitutionTohoku University

Principal Investigator

Saijo Yoshifumi  東北大学, 医工学研究科, 教授 (00292277)

Co-Investigator(Kenkyū-buntansha) 芳賀 洋一  東北大学, 医工学研究科, 教授 (00282096)
Project Period (FY) 2021-07-09 – 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: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Keywords心音図 / 音響CT / 新型コロナウイルス / 肺
Outline of Research at the Start

特別な設備・技術を要さずに安全・簡便に施行でき、かつX線CT検査に匹敵する局所病変検出能のある肺のイメージング手法は、新型コロナウイルス感染のみならず、高齢化社会における老健施設や在宅介護における誤嚥性肺炎の早期診断法としてもその適用範囲は広い。本研究では、心臓で発生した心音を体表に装着した多数の心音センサで同時受信し、逆問題の解法を適用することで、外部からの入力なしに肺内での音速分布を可視化する3次元音響CTを開発し、肺の局所病変が検出可能な計測技術を開発することを目的とする。本研究後には、センサ数の増減により3次元音響CTの高画質化あるいは在宅モニタリング等の臨床応用を目指す。

Outline of Final Research Achievements

A multichannel heart sound measurement system was developed. Heart sound from a point sound source in the heart passes through the surrounding lung parenchyma and is received by heart sound sensors attached to the body surface. By considering the sound velocity of the propagation path and applying the inverse problem, a calculation algorithm was established to reconstruct the sound speed distribution in the chest and to converge the position of the point sound source.
Heart sound sensor based on MEMS technology was developed and constructed a multi-channel heart sound measurement system by amplifying the heart sound with eight 8-channel preamplifiers and inputting it to a PC via an audio interface capable of receiving 64 channels simultaneously. The heart sounds were received from the sensors placed on the body surface, and by estimating the source of the heart sound from the phase difference, useful data for estimating the distribution of sound speed in the thorax was obtained.

Academic Significance and Societal Importance of the Research Achievements

胸部疾患の画像診断としては放射線を用いたCTがゴールデンスタンダードとして用いられているが、近年の新型コロナウイルス感染症における状況を鑑みると、CT検査室に移送するのは困難で、病室やICU内で簡便に胸部疾患をスクリーニングする手法が求められている。本研究では体表に設置した64個のMEMSマイクロホンを心音センサとして心音をサンプリングし、64チャンネル同時受信可能なマルチチャンネル心音計測システムを構築した。さらに、体表で受信した心音の位相解析に逆問題の手法を応用し、胸腔内での音速分布を画像化し音響CTの基礎を築くことで、在宅医療に貢献することが期待される。

Report

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

    (4 results)

All 2023 2022 Other

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

  • [Journal Article] Beyond Conventional Medical Ultrasound Imaging.2023

    • Author(s)
      Saijo Y, Hermawan N, Ikeda H, Shintate R, Furudate S Ishii T
    • Journal Title

      Practical Inverse Problems and Their Prospects

      Volume: 1 Pages: 1-13

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A study on correction method of total acoustic power in presence of shielding in focused ultrasound treatment using acoustic radiation force imaging2023

    • Author(s)
      Numahata E, Yoshizawa S, Umemura S, Ishii T, Saijo Y
    • Journal Title

      Jpn J Appl Phys

      Volume: 62 Issue: SJ Pages: SJ1044-SJ1044

    • DOI

      10.35848/1347-4065/acc595

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 3D ultrasound imaging by synthetic transmit aperture beamforming using a spherically curved array transducer2022

    • Author(s)
      Eiki Hayashi, Naoya Kanno, Ryo Shintate, Takuro Ishii, Ryo Nagaoka and Yoshifumi Saijo
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: SG Pages: SG1034-SG1034

    • DOI

      10.35848/1347-4065/ac51c1

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Remarks] 西條研究室 Saijo Lab

    • URL

      https://www.ecei.tohoku.ac.jp/imaging/

    • Related Report
      2023 Annual Research Report 2022 Research-status Report

URL: 

Published: 2021-07-13   Modified: 2025-01-30  

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