2022 Fiscal Year Final Research Report
Elasticity measurement system of Achilles tendon by continuous shear wave
| Project/Area Number |
20K04499
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 21030:Measurement engineering-related
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| Research Institution | Gunma University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | せん断波 / 粘弾性 / エラストグラフィ / 低周波加振 / 超音波映像法 |
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| Outline of Final Research Achievements |
In recent years, shear wave elastography (SWE) has been devised as a technique for visually and noninvasively evaluating the elastic modulus of living tissue. However, it is difficult to measure a shear wave with a high propagation velocity such as Achilles' tendon due to restrictions on the timing of ultrasonic pulse irradiation. In this study, we constructed a novel elastic modulus measurement system by Continuous Shear Wave Elastography (C-SWE) in order to solve the problem of SWE. Using a small vibration exciter of frequency of around 100Hz, the shear wave is excited in the soft tissue. The shear wave propagating inside the soft tissue is visualized by a method based on the ultrasonic Doppler method. The effectiveness of the proposed method as a method for measuring the elasticity of the Achilles tendon was clarified by both experiments using a phantom simulating a soft tissue, and in vivo experiments.
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| Free Research Field |
超音波による映像形成
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| Academic Significance and Societal Importance of the Research Achievements |
生体組織の弾性は有効な診断情報の1つであるが、従来法では測定法の制約からアキレス腱のような非常に硬い生体組織の映像化が難しいという課題があった。本研究では、従来法の測定値に上限があるという課題に対して、測定できる弾性値に原理的に上限がない、連続せん断波映像法と名付けた新たな方法を提案した。この方法はアキレス腱だけでなく、例えば癌組織のような非常に硬い生体組織の映像化や、筋の伸縮、緊張や姿勢の変化により筋の弾性が変化することを指標の1つとするリハビリテーション等での活用も期待できるなど社会的意義が期待できる。
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