1B-5 Surface Modes of Ultrasound Contrast Agent Microbubbles
1B-5 Surface Modes of Ultrasound Contrast Agent Microbubbles
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1B-5 超声造影剂微泡的表面模式
DOI:
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发表时间:
2006
期刊:
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通讯作者:
D. Lohse
中科院分区:
文献类型:
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作者:
S. van der Meer;B. Dollet;D. Goertz;N. de Jong;M. Versluis;D. Lohse
We study non-spherical oscillations (surface modes) of the coated microbubbles used in ultrasound contrast agents. We show that an acoustic pressure of 100 kPa, at a frequency of 1.7 MHz, is sufficient to excite surface modes for radii between 2 and 4 mum. Surface modes develop as a parametric instability. We derive their evolution equation accounting for the effect of the shell viscoelasticity. We identify a critical radius (1 to 3 mum, depending on the mode number) below which no surface mode can occur