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Development of a novel algorithm for quantitative urodynamics assessment using ultrasound vector flow imaging

Research Project

Project/Area Number 20K22968
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0906:Surgery related to the biological and sensory functions and related fields
Research InstitutionTohoku University

Principal Investigator

Ishii Takuro  東北大学, 学際科学フロンティア研究所, 助教 (50748754)

Project Period (FY) 2020-09-11 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords超音波イメージング / Vector Flow Imaging / ウロダイナミクス / 医用超音波 / ベクターフローイメージング / 生体内流体
Outline of Research at the Start

本研究は、尿道内を通過する排尿流動態を高い時間分解能で可視化する新しい超音波イメージング技術「超音波排尿流ベクターフローイメージング(Uro-VFI)法」を用いて、尿道の排尿機能に関する性状を非侵襲かつ定量的に示す排尿流動態評価アルゴリズムを開発していきます.
特に尿道内の渦流れや乱流性状、流体エネルギー変動の定量化・可視化により、例えば前立腺肥大症など、狭小化・硬化した尿道内腔で、排尿流が「どこで、どのように物理的影響を受けるか」を明らかにする手法を提案します.本研究を通じ、患者固有の下部尿路症状の流体力学的メカニズムを示し、治療の個別化・局所化などへ貢献を目指します.

Outline of Final Research Achievements

We developed a novel ultrasound flow imaging system with a transrectal linear probe to visualize the urinary flow dynamics in the prostatic urethra and acquired flow velocity distributions over space and time in the urethra in patients with lower urinary tract symptoms. In the urethra with structural and mechanical changes, the visualized flow dynamics showed vortex and turbulent flow patterns, which have been expected in the previous studies using computational simulations. In addition, we devised a framework to estimate the pressure distribution and loss in the urethra based on the acquired flow velocity data. To make those techniques applicable in clinical practice, we also developed a robust flow vector imaging technique using a sector probe that will enable trans-abdominal and trans-perinium imaging in the future studies.

Academic Significance and Societal Importance of the Research Achievements

これまで前立腺部尿道内における尿の流れを詳細にイメージングする事は困難であった.本研究は,尿道内臓器の形態や運動性状変化による尿道内の排尿流動態変化の直接的観察の可能性を初めて示し,その流れの評価法を提案する事により,尿道内の詳細な流れベクトル場の活用方法を提案した.こうした知見は,患者固有の下部尿路症状メカニズムの理解や治療選択の個別化や局所療法の発展へ貢献するものと期待される.

Report

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

    (14 results)

All 2023 2022 2021 Other

All Int'l Joint Research (3 results) Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Int'l Joint Research] University of Waterloo(カナダ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of Waterloo(カナダ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Waterloo(カナダ)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Robust flow vector estimation for echocardiography with extended Nyquist velocity using dual-PRF approach: a flow phantom study2023

    • Author(s)
      Okada Yuki、Kanno Naoya、Bhatti Anam、Ishii Takuro、Saijo Yoshifumi
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: SJ Pages: SJ1033-SJ1033

    • DOI

      10.35848/1347-4065/acbda6

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Helical toroid phantom for 3D flow imaging investigations2021

    • Author(s)
      Chee Adrian J Y、Ishii Takuro、Yiu Billy Y S、Yu Alfred C H
    • Journal Title

      Physics in Medicine & Biology

      Volume: 66 Issue: 4 Pages: 045029-045029

    • DOI

      10.1088/1361-6560/abda99

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 尿道内排尿流動態の可視化を実現する高速ベクターフローイメージングシステムの開発2022

    • Author(s)
      石井琢郎, 山西友典, 西條芳文
    • Organizer
      日本超音波医学会 第95回学術集会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Ultrasound Vector Projectile Imaging of Urinary Flow Dynamics2022

    • Author(s)
      Takuro Ishii
    • Organizer
      The 13th Pacific Symposium on Flow Visualization and Image Processing
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ハイフレームレート超音波撮像による尿道内排尿流動態イメージング2022

    • Author(s)
      石井琢郎, 柴田千晴, 鎌迫智彦, 布施美樹, 加賀勘家, 加賀麻祐子, 西條芳文, 山西友典
    • Organizer
      第29回日本排尿機能学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Development And Clinical Validation Of A High-Framerate Transrectal Urodynamic Vector Flow Imaging System2022

    • Author(s)
      Takuro Ishii, Chiharu Shibata, Tomonori Yamanishi, Hassan Nahas, Billy, Y.S. Yiu, Alfred C.H. Yu, Yoshifumi Saijo
    • Organizer
      IEEE International Ultrasonics Symposium 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 排尿流動態のハイフレームレート超音波撮像と流体解析2022

    • Author(s)
      石井琢郎
    • Organizer
      千葉県医師会医学会学術大会 第23回泌尿器科分科会学術講演会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 超音波Vector Flow Imaging技術による尿道内ウロダイナミクス解析の可能性2022

    • Author(s)
      石井琢郎
    • Organizer
      第18回関東ウロダイナミクス研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 超音波ベクターフローイメージングによる排尿流動態の可視化2022

    • Author(s)
      石井琢郎
    • Organizer
      日本機械学会 制御と情報-生体への応用-研究会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Numerical Estimation of the Intraventricular Pressure Gradients Based on Echo-Dynamography and Bernoulli’s Principle2021

    • Author(s)
      Shiho Furudate, Takuro Ishii, Naoya Kanno, Yasuyuki Shiraishi, Yoshifumi Saijo
    • Organizer
      The 42nd Symposium on Ultrasonic Electronics (USE 2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Echo-Dynamography法を用いた心室内圧較差の推定2021

    • Author(s)
      古舘志歩,菅野尚哉,石井琢郎,白石泰之,西條芳文
    • Organizer
      日本超音波医学会 第63回東北地方会学術集会
    • Related Report
      2021 Research-status Report

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Published: 2020-09-29   Modified: 2024-01-30  

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