High-Speed Measurement of B/A for Liquidlike Media by Time-of-Flight Method

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概要

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• Acoustical nonlinearity parameter B/A measurement is reported for soft tissues, because the B/A values of soft tissues have great potential for tissue characterization. The interference method previously reported required about two minutes to obtain the B/A value. High-speed measurement is required to obtain the B/A change, because B/A values at adiabatic and isothermal conditions relate physical factors of soft tissues. Use of the time-of-flight (TOF) method has been reported to obtain B/A values at about 60 times atmospheric pressure. However, since physical characteristics in soft tissues usually change under such circumstances, the tissue characterization requires B/A values obtained at near-normal pressures. In this paper, we describe an improvement of the high-speed measurement method for liquidlike media under the pressurized condition of 3 times atmospheric pressure. We studied change in B/A as a function of time in a pressure chamber.

• 社団法人応用物理学会の論文
• 1993-05-30

著者

• KOJIMA Kenji

  Department of Superconductivity, The University of Tokyo

• ITOH Takeshi

  Department of Physics, University of Tokyo

• Kojima Kenji

  Department Of Physics Graduate School Of Science University Of Tokyo

• Endo Nobuyuki

  Faculty Of Engineering Kanagawa University

• Endoh N

  Kanagawa Univ. Yokohama Jpn

• Endoh Nobuyuki

  Department Of Electrical Electronics And Information Engineering Kanagawa University

• Endoh Nobuyuki

  Department Of Electrical Electronics And Information Engineering Faculty Of Engineering Kanagawa Uni

• Itoh Takeshi

  Department Of Physics University Of Tokyo

• KIBUKAWA Hiroshi

  Department of Electrical Engineering, Faculty of Engineering, Kanagawa University

• KURAKAMI Ken-ichi

  Department of Electrical Engineering, Faculty of Engineering, Kanagawa University

• Kibukawa Hiroshi

  Department Of Electrical Engineering Faculty Of Engineering Kanagawa University

• Kurakami Ken-ichi

  Department Of Electrical Engineering Faculty Of Engineering Kanagawa University

• Kojima Kenji

  Department Of Electrical Engineering Faculty Of Engineering Kanagawa University

• Itoh Takeshi

  Department Of Applied Physics Faculty Of Engineering Osaka University

• Endoh Nobuyuki

  Department of Electrical and Electronic Information Engineering, Kanagawa University, Yokohama 221-8624, Japan

• Kojima Kenji

  Department of Chemistry, Faculty of Sciences, Gakushuin University

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