Artifact Trapping During Time Reversal Photoacoustic Imaging for Acoustically Heterogeneous Media
Artifact Trapping During Time Reversal Photoacoustic Imaging for Acoustically Heterogeneous Media
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DOI：
10.1109/tmi.2009.2032358
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发表时间：
2010-02-01
影响因子：
10.6
通讯作者：
Treeby, Bradley E.
中科院分区：
文献类型：
--
作者：
Cox, Benjamin T.;Treeby, Bradley E.
光声层析成像的重建算法有很多种，其中大多数都假设介质的声学特性是恒定的和均匀的。在实践中，在声学特性中通常存在未知的空间变化，并且这些算法充其量仅给出真实图像的近似估计。因此，在这种情况下，哪种办法最有效的问题具有实际重要性。图像重建的“时间反转”-使用一个数值传播模型与时变边界条件对应的测量数据在反转的时间顺序-已被证明是限制性较低的假设比大多数，因此，一个很好的候选人的一般和实际有用的算法。在这里，它示出，这样的重建算法可以“陷阱”的时间反转的散射波，导致在图像区域内的伪影。提出了两种减轻这种影响的方法。
Several different reconstruction algorithms have been proposed for photoacoustic tomography, most of which presuppose that the acoustic properties of the medium are constant and homogeneous. In practice, there are often unknown spatial variations in the acoustic properties, and these algorithms give, at best, only approximate estimates of the true image. The question as to which approach is the most robust in these circumstances is therefore one of practical importance. Image reconstruction by "time reversal"-using a numerical propagation model with a time-varying boundary condition corresponding to the measured data in reversed temporal order-has been shown to be less restrictive in its assumptions than most, and therefore a good candidate for a general and practically useful algorithm. Here, it is shown that such reconstruction algorithms can "trap" time reversed scattered waves, leading to artifacts within the image region. Two ways to mitigate this effect are proposed.