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arXiv 1902.10317math.NAcs.NA
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在贝叶斯框架下的扩散光学断层成像

Diffusive optical tomography in the Bayesian framework

University of Wisconsin-Madison(威斯康星大学麦迪逊分校);California Institute of Technology(加州理工学院)

Kit Newton, Qin Li, Andrew Stuart

AI总结:

本文研究了在强散射条件下,利用贝叶斯框架将辐射传输方程(RTE)近似为扩散方程(DE)的逆问题,并证明了逆RTE向逆DE的收敛性。

摘要:

许多自然科学中的自然发生模型可以很好地用简化模型近似,使用多尺度技术。在这种情况下,自然会询问由原始问题定义的反问题与由多尺度近似定义的反问题之间的关系。我们开发了一种解决这个问题的方法,并在光学断层成像的背景下进行了示例。光学断层成像是一种通过测量入射和出射光强度来推断生物组织性质的技术;它可以作为一种医疗成像方法。数学上,光传播由辐射传输方程(RTE)建模,而光学断层成像相当于从边界测量中重建RTE中的散射和吸收系数。我们研究这个问题的贝叶斯框架,重点是强散射条件。在这种情况下,正向RTE接近扩散方程(DE)。我们研究了在正向问题接近DE的渐进行为下的RTE,并证明了逆RTE在非线性和线性设置中对逆DE的收敛性。通过研究两种后验分布之间的距离,使用Hellinger度量和Kullback-Leibler散度来证明收敛性。

英文摘要:

Many naturally-occuring models in the sciences are well-approximated by simplified models, using multiscale techniques. In such settings it is natural to ask about the relationship between inverse problems defined by the original problem and by the multiscale approximation. We develop an approach to this problem and exemplify it in the context of optical tomographic imaging. Optical tomographic imaging is a technique for infering the properties of biological tissue via measurements of the incoming and outgoing light intensity; it may be used as a medical imaging methodology. Mathematically, light propagation is modeled by the radiative transfer equation (RTE), and optical tomography amounts to reconstructing the scattering and the absorption coefficients in the RTE from boundary measurements. We study this problem in the Bayesian framework, focussing on the strong scattering regime. In this regime the forward RTE is close to the diffusion equation (DE). We study the RTE in the asymptotic regime where the forward problem approaches the DE, and prove convergence of the inverse RTE to the inverse DE in both nonlinear and linear settings. Convergence is proved by studying the distance between the two posterior distributions using the Hellinger metric, and using Kullback-Leibler divergence.

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