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arXiv 2301.08693math.NAcs.NA
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光声层析成像中含未知函数的正向非线性逆问题的自监督学习

Self-supervised learning for a nonlinear inverse problem with forward operator involving an unknown function arising in photoacoustic tomography

Gyeongha Hwang, Gihyeon Jeon, Sunghwan Moon

摘要:

在这篇文章中,我们关注的是一个非线性反问题的前向算子涉及一个未知的功能。这个问题出现在不同的应用中,并且在存在未知函数的情况下具有挑战性,这使得它不适定。此外,问题的非线性性质使得难以使用传统方法,因此,该研究通过线性化或假设未知函数的知识来解决问题的简化版本。在这里,我们提出了自监督学习来直接解决涉及未知函数的非线性逆问题。特别是,我们专注于一个逆问题,在光声断层扫描(PAT),这是一个混合的医学成像具有高分辨率和对比度。PAT可以基于波动方程建模。所测量的数据提供了对方程的解,该方程被限制为包含关于感兴趣对象的生物信息的方程的表面和初始压力。方程中声波的速度是未知的。我们的目标是同时确定声波的初始压强和速度。在简单假设声速是初始压力的函数的情况下,该问题变成涉及未知函数的非线性反问题。实验结果表明,该框架执行成功。

英文摘要:

In this article, we are concerned with a nonlinear inverse problem with a forward operator involving an unknown function. The problem arises in diverse applications and is challenging in the presence of an unknown function, which makes it ill-posed. Additionally, the nonlinear nature of the problem makes it difficult to use traditional methods, and thus, the study addresses a simplified version of the problem by either linearizing it or assuming knowledge of the unknown function. Here, we propose self-supervised learning to directly tackle a nonlinear inverse problem involving an unknown function. In particular, we focus on an inverse problem derived in photoacoustic tomograpy (PAT), which is a hybrid medical imaging with high resolution and contrast. PAT can be modeled based on the wave equation. The measured data provide the solution to an equation restricted to surface and initial pressure of an equation that contains biological information on the object of interest. The speed of a sound wave in the equation is unknown. Our goal is to determine the initial pressure and the speed of the sound wave simultaneously. Under a simple assumption that sound speed is a function of the initial pressure, the problem becomes a nonlinear inverse problem involving an unknown function. The experimental results demonstrate that the proposed framework performs successfully.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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