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Synchrotron radiation based phase X-ray tomography for mechanical analysis of structural heart disease

Research Project

Project/Area Number 21K08843
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 55030:Cardiovascular surgery-related
Research InstitutionKobe University

Principal Investigator

Tsukube Takuro  神戸大学, 医学研究科, 非常勤講師 (50304100)

Co-Investigator(Kenkyū-buntansha) 星野 真人  公益財団法人高輝度光科学研究センター, 分光推進室, 主幹研究員 (30508461)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords僧帽弁腱索 / 位相差X線CT法 / 膠原繊維 / Tenomoduline / 僧帽弁閉鎖不全症 / 放射光位相差X線CT法 / 心構造疾患群の構造解析
Outline of Research at the Start

本研究の最終目的は、心不全の主原因である僧帽弁閉鎖不全症をはじめとする心構造疾患の発症メカニズムを解明し、手術を含めた最適な治療法を解明する事にある。
大型放射光施設放射SPring8 による位相差X 線CT 法を利用して非破壊検査にて僧帽弁弁下組織・時に僧帽弁腱索の分子構造解析を行い、疾患特異的な分子構造異常を解析し、僧帽弁腱索変性の機序を明らかとする。その上で当該疾患群の治療成績を解析し、放射光位相差エック線CT法による解析結果と符合し最適な治療法を提言する事を期間内の目的とする。

Outline of Final Research Achievements

The link between the structural property and the rupturing of chordae tendineae in the mitral valve complex is still unclear. Synchrotron radiation-based X-ray phase computed tomography (SR-XPCT) imaging has been employed, we measured the density of 6 ruptured mitral chordae tendineae, obtained during surgical repairs for mitral regurgitation, and 12 healthy chordae tendineae, obtained from autopsies. The specimens were subsequently analyzed pathologically. The mean densities were 1.0288±0.0043 in the rupture group and 1.0848±0.0147 g/cm3 in the control group (p<0.0001). Histological examination revealed a change in the components of the connective tissues in ruptured chordae tendineae, in accordance with the low density measured by SR-XPCT. SR-XPCT made it possible to measure tissue density in mitral chordae tendineae. Low density in mitral chordae tendineae is associated with a greater fragility in ruptured mitral chordae tendineae.

Academic Significance and Societal Importance of the Research Achievements

位相差X 線CT法を利用し僧帽弁閉鎖不全症の異常構造を三次元・非破壊で解析し、僧帽弁腱索の異常構造をCT像として可視化しえた。その主な学術的意義として2022年にアメリカ胸部心臓外科学会の僧帽弁ワークショップで成果を講演、2023年に誌上発表した。位相差X線CT像と病理学的所見と一致した。腱索内の組織密度測定は、高周波心臓超音波検査法などで再現が可能であり、腱索断裂前の腱索異常を早期にとらえられる可能性を示唆している。さらに形成術術中に温存する腱索の異常をとらえられる可能性があり再発予防に寄与しえる。社会的意義として僧帽弁弁下組織異常の早期検出は、多数の患者の治療・予防に直結すると期待される。

Report

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

    (3 results)

All 2023 2022 2021

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

  • [Journal Article] Structural properties in ruptured mitral chordae tendineae measured by synchrotron-based X-ray phase computed tomography2023

    • Author(s)
      Koda Yojiro、Tsukube Takuro、Hoshino Masato、Yagi Naoto、Ishibashi-Ueda Hatsue、Okada Kenji
    • Journal Title

      Journal of Synchrotron Radiation

      Volume: 30 Issue: 5 Pages: 995-1002

    • DOI

      10.1107/s1600577523005167

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Structural Properties in Ruptured Mitral Chordae Tendineae Measured by Synchrotron-Based X-ray Phase Tomography2022

    • Author(s)
      Yojiro Koda, Takuro Tsukube, Masato Hoshino, Kentaro Uesugi Naoto Yagi, Hatsue Ueda, Kenji Okada
    • Organizer
      AATS Mitral Conclave2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Structural Properties in Ruptured Mitral Chordae Tendineae Measured by Synchrotron-Based X-ray Phase Tomography2021

    • Author(s)
      Yojiro. Koda, Takuro Tsukube, Masato Hoshino, Naoto Yagi, Kentaro Uesugi, Kenji Okada
    • Organizer
      AATS Mitral Conclave 2022
    • 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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