Frequency Dependences of Sound Attenuation and Phase Velocity in Suspensions Containing Encapsulated Microbubbles

YU Jin-Fei; ZHANG Dong; GONG Xiu-Fen; GONG Yan-Jun; ZHU Zhe-Min; LIU Xue-Ming

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Frequency Dependences of Sound Attenuation and Phase Velocity in Suspensions Containing Encapsulated Microbubbles

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@@ Frequency dependences of the sound attenuation and phase velocity in an encapsulated bubbly liquid, such as ultrasound contrast agent or Levovist(R) suspensions, at three different concentrations are studied over a bandwidth 1.5-4.5MHz by using an ultrasonic spectroscopy technique.Measurement of acoustic attenuation spectra demonstrates that the resonant frequency of the Levovist(R) suspension is nearly 2.3-2.5 MHz, and the sound attenuation enhances with the increasing concentration.With the measured sound attenuation spectra, the shear modulus and the shear viscosity are estimated to be 80Mpa and 1.3Pas, respectively.The phase velocity exhibits a rapid rise with frequency smaller than 3.0 MHz, then appears to approach a frequency-independent limit above 3.0 MHz, and the change of the phase velocity over the measured frequency range is also proportional to the concentration.

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《中国物理快报：英文版》 |2005年第4期|892-895|共4页
作者
YU Jin-Fei; ZHANG Dong; GONG Xiu-Fen; GONG Yan-Jun; ZHU Zhe-Min; LIU Xue-Ming;
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State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093;

State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093;

State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093;

State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093;

State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093;

Second Affiliated Hospital, College of Medicine, Zhejiang University, Zhejiang 310009;

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中图分类物理学;
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Frequency Dependences of Sound Attenuation and Phase Velocity in Suspensions Containing Encapsulated Microbubbles

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