Ultrafast ultrasound imaging of surface acoustic waves induced by laser excitation compared with acoustic radiation force.
Ultrafast ultrasound imaging of surface acoustic waves induced by laser excitation compared with acoustic radiation force.
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DOI：
10.1364/ol.383932
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发表时间：
2020-04-01
期刊：
影响因子：
3.6
通讯作者：
Emelianov SY
中科院分区：
文献类型：
--
作者：
Zhao L;Vanderlaan D;Yoon H;Liu J;Li C;Emelianov SY
两个产生机制-光扰动和声辐射力（ARF）-进行了研究，其中高帧率超声成像用于跟踪诱导SAW的传播。我们比较了ARF诱导的SAW与激光诱导的SAW产生的激光束照射的均匀吸收的组织样粘弹性幻影，其中光优先吸收在表面。我们还比较了由ARF与脉冲激光产生的SAW的频率内容，使用相同的激发持续时间。SAW带宽的差异是预期的，因为一般来说，激光可以聚焦到一个较小的区域。最后，我们比较了当波的起源在表面以下时波的产生和传播。我们还研究了剪切波振幅与光通量的关系。本文的研究结果将为激光诱导声表面波的产生和成像在生命科学等领域的应用提供新的思路。
Two generation mechanisms—optical perturbation and acoustic radiation force (ARF)—were investigated where high frame rate ultrasound imaging was used to track the propagation of induced SAWs. We compared ARF-induced SAWs with laser-induced SAWs generated by laser beam irradiation of the uniformly absorbing tissue-like viscoelastic phantom, where light was preferentially absorbed at the surface. We also compared the frequency content of SAWs generated by ARF versus pulsed laser light, using the same duration of excitation. Differences in the SAW bandwidth were expected because, in general, laser light can be focused into a smaller area. Finally, we compared wave generation and propagation when the wave’s origin was below the surface. We also investigated the relationship between shear wave amplitude and optical fluence. The investigation reported here can potentially extend the applications of laser-induced SAW generation and imaging in life sciences and other applications.