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arXiv 2103.16677math.AP
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基于部分数据的定量光声层析成像的Hölder稳定性

Hölder stability of quantitative photoacoustic tomography based on partial data

Faouzi Triki, Qi Xue

摘要:

考虑利用逆光声层析成像(PAT)第一步得到的解的内部信息重建扩散方程的扩散系数和吸收系数。在实际应用中,由于介质的高吸收特性和设备的限制,在边界附近只能提供部分内部信息。我们的主要贡献是证明一个Hölder稳定性的反问题在一个子区域的内部信息是可靠的基础上的扩散系数满足的柯西问题的稳定性估计提供。当子区域向边界收缩时,Hölder稳定性的指数收敛到与子区域无关的正常数。数值实验表明,对于光滑甚至不连续介质,局部重建扩散系数和吸收系数是可能的。

英文摘要:

We consider the reconstruction of the diffusion and absorption coefficients of the diffusion equation from the internal information of the solution obtained from the first step of the inverse photoacoustic tomography (PAT). In practice, the internal information is only partially provided near the boundary due to the high absorption property of the medium and the limitation of the equipment. Our main contribution is to prove a Hölder stability of the inverse problem in a subregion where the internal information is reliably provided based on the stability estimation of a Cauchy problem satisfied by the diffusion coefficient. The exponent of the Hölder stability converges to a positive constant independent of the subregion as the subregion contracts towards the boundary. Numerical experiments demonstrates that it is possible to locally reconstruct the diffusion and absorption coefficients for smooth and even discontinuous media.

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