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ESTIMATION OF SHEAR ELASTICITY OF BIOTISSUES USING SURFACE WAVES

Research Project

Project/Area Number 08680939
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Biomedical engineering/Biological material science
Research InstitutionMEIJI UNIVERSITY

Principal Investigator

CHOI Pak-kon  MEIJI UNIVERSITY,DEPARTMENT OF PHYSICS,ASSOCIATE PROFESSOR, 理工学部, 助教授 (30143530)

Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥900,000 (Direct Cost: ¥900,000)
KeywordsBiotissues / Surface waves / Shear elasticity / Gel / Chicken breast muscle / Bovine myocardium / Bovine lever / 牛レバ- / ゾル-ゲル転移
Research Abstract

A noble experiment was made, aiming to measure shear elasticity in soft materials such as biotissues and gels using suf ace acoustic waves. Extensive ultrasonic studies have been made in biotissues. However, very few studies on shear elasticity have been reported. In the present study surface wave velocity and absorption were measured in fibrous tissues, chicken breast muscle and bovine myocardium. The shear elasticity derived from the surface wave properties showed large direction dependence along the fibrous structure. This is marked contrast with the ultrasonic properties which showed small direction dependence. Elastic stiffness tensors were determined in these tissues.
Propagation of surface waves has not been clarified in the case that both surface tension and elasticity are operating as a restoring force. I and Prof.Y.Onodera of meiji University have derived the dispersion equation and have found that two kinds of surface wave modes are able to propagate in a gel state : Rayleigh type surface waves and leaky surface tension waves. The latter was predicted for the first time. The surface wave measurementsin gelatin sol and gel showed the exsitence of the two modes. The present study provides a new tool for investigating elasticity in soft materials.

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] H.Takahashi, P-K.Choi: "Sol-Gel Transition ingelatin observed with surface waves" Jpn.J.Appl.Phys.35. 2939-2943 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 山本晃央, 崔博坤: "ゼラチンのゲル化による超音波音速・吸収変化" 日本音響学会誌. 53. 179-184 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Onodera, P-K.Choi: "Surface-wave modes on soft gels" J.Acoust.Soc.Am.104. 3358-3363 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] H.Takahashi and P.-K.Choi: ""Sol-gel transition in gelatin observed with surface waves"" Jpn.J.Appl.Phys. vol.35, (5B). 2939-2943 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Yamamoto and P.-K.Choi: ""Ultrasonic velocity and absorption studies on gelation in gelatin (in Japanese)"" J,Acoust.Soc.Jpn.53. 179-184 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Onodera and P.-K.Choi: ""Surface-wave modes on soft gels"" J.Acoust.Soc.Am.104. 3358-3363 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Onodera,P.-K.Choi: "Surface-wave modes on soft gels" J.Acoust.Soc.Am.104(6). 3358-3363 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] H.Takahashi,P-K.Choi: "Sol-Gel Transition in Gelatin Observod with Surface Waves" Jpn.J.Appl.Phys.35巻5B. 2939-2943 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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