Characterization of high intensity focused ultrasound transducers using acoustic streaming
Characterization of high intensity focused ultrasound transducers using acoustic streaming
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DOI：
10.1121/1.2835662
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发表时间：
2008-03-01
影响因子：
2.4
通讯作者：
Banerjee, Rupak K.
中科院分区：
文献类型：
--
作者：
Hariharan, Prasanna;Myers, Matthew R.;Banerjee, Rupak K.
提出了一种表征高强度聚焦超声 (HIFU) 换能器的新方法。该技术基于液体介质中 HIFU 光束吸收所产生的声流场。使用数字粒子图像测速法对流场进行量化，并采用数值算法来计算产生观察到的流场的声强度场。这里提出的方法适用于中等强度范围，高于可能损坏传统水听器的强度，但低于非线性传播效应明显的水平。使用流式方法预测的强度场和声功率与使用水听器和辐射力天平获得的测量结果一致在 10% 以内。除了声强度场之外，流技术还可用于确定其他重要的 HIFU 参数，例如波束倾斜角或传播介质的吸收。 0 2008 美国声学学会。
A new approach for characterizing high intensity focused ultrasound (HIFU) transducers is presented. The technique is based upon the acoustic streaming field generated by absorption of the HIFU beam in a liquid medium. The streaming field is quantified using digital particle image velocimetry, and a numerical algorithm is employed to compute the acoustic intensity field giving rise to the observed streaming field. The method as presented here is applicable to moderate intensity regimes, above the intensities which may be damaging to conventional hydrophones, but below the levels where nonlinear propagation effects are appreciable. Intensity fields and acoustic powers predicted using the streaming method were found to agree within 10% with measurements obtained using hydrophones and radiation force balances. Besides acoustic intensity fields, the streaming technique may be used to determine other important HIFU parameters, such as beam tilt angle or absorption of the propagation medium. 0 2008 Acoustical Society of America.