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Ultrasonic signed echo imaging to distinguish bwtween vulnerable and stable plaques

Research Project

Project/Area Number 21K12699
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 90130:Medical systems-related
Research InstitutionTohoku University

Principal Investigator

Umemura Shin-ichiro  東北大学, 医工学研究科, 学術研究員 (20402787)

Co-Investigator(Kenkyū-buntansha) 西條 芳文  東北大学, 医工学研究科, 教授 (00292277)
吉澤 晋  東北大学, 工学研究科, 教授 (30455802)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords符号付きエコー像 / 基本波 / 2倍周波 / 不安定プラーク / 2Dアレイプローブ / 基本周波 / 安定プラーク / 2Dアレイ・プローブ / 音響インピーダンス / 反射エコー / 第2高調波 / アレイ受信器 / 位相検出 / 有限要素法 / 反射体モデル / 超音波イメージング / 符号付きエコー / 1.5Dアレイプローブ
Outline of Research at the Start

動脈硬化症をクリーニングするにあたり,頸動脈エコー検査は,有効であり広く用いられている.そこで発見されるプラークについて,それが不安定性であるか否かを判別することは,治療方針を決定するにあたってきわめて重要である.頸動脈の不安定プラークは,それが破綻して脳梗塞を直接引き起こす危険性があるだけでなく,脳動脈や冠動脈に同様の不安定性プラークが生じている可能性を示唆するためである.本研究の目的は,エコー信号の符号を検出し,それにより,不安定プラークのように周囲よりも音響インピーダンスの低い組織と,逆に安定プラークのように高い組織とを識別可能とし,治療方針決定に役立つ技術を実現することにある.

Outline of Final Research Achievements

The purpose of this study is to distinguish reflectors with acoustic impedances lower and higher than the surrounding medium, which correspond to unstable and stable plaques in blood, respectively. The principle is detecting the phase of the second harmonic echo in reference to that of the squared fundamental echo. 3D propagation of ultrasound, transmitted and received by a 2D array probe, was numerically simulated. Unstable and stable plaques were modeled by 1 mm diameter spheres of fat and connective tissue, respectively. They were exposed to short plane wave pulses at 5 and 10 MHz. The reflected echoes were received by a circular aperture with F/2.5 and processed by employing the proposed method, resulting in a 2D echo image, in which negatively and positively signed echoes, corresponding to fat and connective tissue balls, respectively. Possibility of 2D sighed echo imaging, which can distinguish unstable and stable plaques in blood, was confirmed.

Academic Significance and Societal Importance of the Research Achievements

頸動脈エコー検査は,動脈硬化を視覚的かつ非侵襲的に捕えることができるため,動脈硬化のスクリーニングに広く用いられている.頸動脈エコー検査によりプラークが検出された場合,それが不安定性であるか否かを判別することが重要である.頸動脈の不安定プラークは,それが破綻して脳梗塞を直接引き起こす危険性があるだけでなく,脳動脈や冠動脈に同様の不安定プラークが生じている可能性を示唆するためである.不安定プラークの音響インピーダンスは血液よりも低いため,そのエコーの位相は送信波に対し反転する.本研究は,符号付けエコー像によってこれが検出可能であることを数値シミュレーションにより確かめたもので,その意義大である.

Report

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

    (15 results)

All 2024 2023 2022 2021

All Journal Article (12 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 12 results,  Open Access: 3 results) Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Improvement of contrast ratio between cavitation bubbles and tissue by frequency filtering in triplet pulse ultrasound imaging2024

    • Author(s)
      Kuji Shota、Umemura Shin-ichiro、Yoshizawa Shin
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 63 Issue: 4 Pages: 04SP10-04SP10

    • DOI

      10.35848/1347-4065/ad2d06

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [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
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Basic study on a filtering method for selectively extracting cavitation bubble region in ultrasound imaging by triplet pulse sequence2023

    • Author(s)
      Kuji Shota、Umemura Shin-ichiro、Yoshizawa Shin
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: SJ Pages: SJ1038-SJ1038

    • DOI

      10.35848/1347-4065/acbe03

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development of efficient method of generating reactive oxygen species by expanding cavitation region using ultrasound focus scanning in the direction of ultrasound propagation2023

    • Author(s)
      Miyake Shotaro、Umemura Shin-ichiro、Yoshizawa Shin
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: SJ Pages: SJ1052-SJ1052

    • DOI

      10.35848/1347-4065/accaf0

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Quantitative analysis of heat-source estimation of high-intensity focused ultrasound using thermal strain imaging2022

    • Author(s)
      Obara Nozomi, Umemura Shin-ichiro, Yoshizawa Shin
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 61 Issue: SG Pages: SG1062-SG1062

    • DOI

      10.35848/1347-4065/ac5d15

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Improvement of extrapolating frequency response of hydrophone sensitivity using numerical simulation that includes assumptions about materials and construction of hydrophone for measuring instantaneous acoustic pressure of diagnostic ultrasound2022

    • Author(s)
      Chiba Yusuke, Umemura Shin-ichiro, Yoshioka Masahiro
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 61 Issue: 6 Pages: 066502-066502

    • DOI

      10.35848/1347-4065/ac5262

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effect of difference in shear modulus of biological tissue on heat source distribution of high-intensity focused ultrasound estimated by acoustic radiation force imaging2021

    • Author(s)
      Yabata Hiroki、Umemura Shin-ichiro、Yoshizawa Shin
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: SD Pages: SDDE23-SDDE23

    • DOI

      10.35848/1347-4065/abf4a7

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effects from correction of speed of sound in transmit and receive beamforming using focus beam2021

    • Author(s)
      Nagaoka Ryo、Yoshizawa Shin、Umemura Shin-ichiro、Hasegawa Hideyuki
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: SD Pages: SDDE19-SDDE19

    • DOI

      10.35848/1347-4065/abf55b

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effect of ultrasonic intensity and intervals of ultrasonic exposure on efficiency of sonochemiluminescence in gel phantom for sonodynamic therapy2021

    • Author(s)
      Tsukahara Kenki、Umemura Shin-ichiro、Yoshizawa Shin
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: SD Pages: SDDE12-SDDE12

    • DOI

      10.35848/1347-4065/abf4a4

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effect of focal spot scanning method in agarose gel and chicken breast on heating efficiency in cavitation-enhanced ultrasonic heating2021

    • Author(s)
      Ueda Kohei、Ito Sayaka、Umemura Shin-ichiro、Yoshizawa Shin
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: SD Pages: SDDE13-SDDE13

    • DOI

      10.35848/1347-4065/abf2a8

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Comparison between thermal strain and acoustic radiation force imaging methods for estimation of heat source distribution of high-intensity focused ultrasound2021

    • Author(s)
      Obara Nozomi、Umemura Shin-ichiro、Yoshizawa Shin
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: SD Pages: SDDE04-SDDE04

    • DOI

      10.35848/1347-4065/abef0a

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Investigation of feasibility of noise suppression method for cavitation-enhanced high-intensity focused ultrasound treatment2021

    • Author(s)
      Takagi Ryo、Koseki Yoshihiko、Yoshizawa Shin、Umemura Shin-ichiro
    • Journal Title

      Ultrasonics

      Volume: 114 Pages: 106394-106394

    • DOI

      10.1016/j.ultras.2021.106394

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Highly Sensitive CMUT with Built-in Low-Voltage FET2022

    • Author(s)
      Yoshitaka Tadaki, Shin-ichiro Umemura
    • Organizer
      2022 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Highly Sensitive Small Hydrophone with Built-in Stealth Preamplifier2022

    • Author(s)
      Shin-ichiro Umemura, Kaoru Ogaya, Yoshiaki Takemoto, Yoshitaka Tadaki
    • Organizer
      2022 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Study of Waveform Recovery by Deconvolution using Simulated Hydrophone2021

    • Author(s)
      Umemura Shin-ichiro、Yoshizawa Shin
    • Organizer
      IEEE International Ultrasonics Symposium 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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