吸收介质时间反转聚焦与反滤波的比较

M. Tanter, J. Thomas, M. Fink
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引用次数: 6

摘要

为了使用相控阵在非均匀介质中聚焦超声波,必须计算应用于该阵列换能器上的最佳信号集(对于单色波,振幅和相位(D.R. Jackson和D.R. Dowling, 1991))。通过时间反转处理(TRP)得到的解对应于与介质中可用的初始源匹配的时空滤波器。然而,这个过程并不能保证在其他位置的场振幅尽可能小。作者之前已经用聚焦人类头骨的例子说明了这个问题,头骨是一种吸收介质。作者发现,为了获得良好的聚焦,有必要在时间反转过程中加入考虑吸收的幅度补偿。另一种方法是在颅骨两侧使用一整套换能器。测量并比较了匹配滤波、反滤波和振幅补偿与时间反转相结合三种情况下得到的焦质。
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Comparison between time reversal focusing in absorbing medium and inverse filtering
To focus ultrasonic waves in inhomogeneous media using a phased array, one has to calculate the optimal set of signals (for monochromatic waves, amplitude and phase (D.R. Jackson and D.R. Dowling, 1991)) to be applied on the transducers of the array. The solution obtained by Time Reversal Processing (TRP) corresponds to the spatial and temporal filter matched to an initial source available in the medium. However, this process doesn't ensure that the field amplitude at other locations is as small as possible. The authors have illustrated this problem previously using the example of focusing through the human skull, which is an absorbing medium. The authors found that in order to obtain good focusing, it is necessary to add to the time reversal process an amplitude compensation that takes into account absorption. Another approach consists in using an entire array of transducers on both sides of the skull. The authors measure and compare the focal quality obtained in the different cases: matched filter, inverse filter and amplitude compensation combined with time reversal.
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