Quantitative analysis of Doppler spectrum modifications yielded by contrast agents insonified at high pressure

Tortoli P.; Bagnai D.

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Quantitative analysis of Doppler spectrum modifications yielded by contrast agents insonified at high pressure

机译：高压超声造影剂产生的多普勒频谱修饰的定量分析

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In this report, the authors consider the modifications yielded in the Doppler spectrum when acoustic fields of increasing intensities are applied to encapsulated gas bubbles. Their in vitro experimental results show that the spectrum bandwidth is nearly proportional to the incident acoustic pressure, when its amplitude is maintained below about 200 kPa. At higher pressure levels, it even may happen that, in a steady, unidirectional flow (which should generate only positive Doppler frequencies), the Doppler spectrum is enlarged up to the point that negative Doppler shifts also are produced. Possible explanations in terms of either radiation force or streaming are discussed for this asymmetrical bandwidth enlargement.

机译：在这份报告中，作者考虑了当将强度增加的声场应用于封装的气泡时，在多普勒频谱中产生的变化。他们的体外实验结果表明，当其幅度保持在约200 kPa以下时，频谱带宽几乎与入射声压成正比。在较高的压力水平下，甚至可能会在稳定的单向流中（应该只生成正的多普勒频率）将多普勒频谱扩大到产生负多普勒频移的程度。对于这种不对称带宽的扩大，讨论了关于辐射力或流的可能解释。

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《IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control》 |1999年第1期|P.247-251|共5页
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Tortoli P.; Bagnai D.;
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1. Quantitative analysis of Doppler spectrum modifications yielded bycontrast agents insonified at high pressure [J] . Tortoli P., Bagnai D., Righi D. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control . 1999,第1期

机译：高压声波造影剂产生的多普勒频谱修饰的定量分析
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4. Properties of contrast agents insonified at frequencies above 10 MHz [C] . Morgan, K., Dayton, . 1996

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Quantitative analysis of Doppler spectrum modifications yielded by contrast agents insonified at high pressure

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