Response of bubbles to diagnostic ultrasound: a unifying theoretical approach
Response of bubbles to diagnostic ultrasound: a unifying theoretical approach
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DOI：
10.1007/s100510050375
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发表时间：
1998-07-01
影响因子：
1.6
通讯作者：
Zomack, M
中科院分区：
文献类型：
--
作者：
Hilgenfeldt, S;Lohse, D;Zomack, M
研究了超声诊断用造影剂中径为1微米的气泡对超声的散射。我们发现，声音散射和振动气泡发出的“主动”声音并不矛盾，而是源自同一物理的两个不同方面。将气泡视为一个非线性振子，得到了散射截面和吸收截面的一般公式。我们证明了几个著名的公式在这一点的线性极限内被恢复。然而，在强烈非线性振动的情况下，截面可能比线性响应的截面大几个数量级。然后，入射声能的主要部分被转换成发射的声音，这与线性情况下发生的情况不同，线性情况下的吸收截面超过了散射截面。
The scattering of ultrasound from bubbles of similar to 1 mu m radius, such as used in contrast enhancers for ultrasound diagnostics, is studied. We show that sound scattering and "active" emission of sound from oscillating bubbles are not contradictory, but are just two different aspects derived from the same physics. Treating the bubble as a nonlinear oscillator, we arrive at general formulas for scattering and absorption cross-sections. We show that several well-known formulas are recovered in the linear limit of this ansatz. In the case of strongly nonlinear oscillations, however, the cross-sections can be larger than those for linear response by several orders of magnitude. The major part of the incident sound energy is then converted into emitted sound, unlike what happens in the linear case, where the absorption cross-sections exceed the scattering cross-sections.