Parametrix for the inverse source problem of thermoacoustic tomography with reduced data

Parametrix for the inverse source problem of thermoacoustic tomography with reduced data
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减少数据的热声层析成像反源问题的参数

DOI:
10.1088/1361-6420/abde16
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发表时间:
2021
期刊:
影响因子:
2.1
通讯作者:
Kunyansky, L
Kunyansky, L
中科院分区:
数学2区
文献类型:
--
作者:
Eller, M;Kunyansky, L

文献摘要

参考文献

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我们的目标是解决热声和光声层析成像的逆源问题,将数据记录在部分围绕声波源的开放表面上。改进的时间反转算法将源项恢复到无穷光滑的误差项。与Eller M等(Eller M等人2020年反问题36 085012)类似,数值模拟表明误差项在实际意义上很小。与后一种方法不同,本技术适用于存在已知可变声速的情况。从计算的角度来看,它的效率也要高得多。它可以使用标准的有限差分技术实现,也可以通过基于分离变量的方法实现,对于特殊的几何形状,可以产生极快的图像重建。我们用2维和3维的数值模拟来说明我们的结果。
Our goal is to solve the inverse source problem of thermo-and photoacoustic tomography, with data registered on an open surface partially surrounding the source of acoustic waves. The proposed modified time reversal algorithm recovers the source term up to an infinitely smooth error term. Similarly to (Eller M et al 2020 Inverse Problems 36 085012), numerical simulations show that the error term is quite small in practical terms. Unlike the latter method, the present technique is applicable in the presence of a known variable speed of sound. It is also significantly more efficient from a computational standpoint. It can be implemented using either standard finite difference techniques or through methods based on separation of variables, that for special geometries yield extremely fast image reconstruction. We illustrate our results with numerical simulations in 2 and 3 spatial dimensions.
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