斑点成像中的聚焦过程自画像：III. 设计复数空间-时间聚焦定律以克服反射成像中的回声
Self-Portrait of the Focusing Process in Speckle: III. Tailoring Complex Spatio-Temporal Focusing Laws To Overcome Reverberations in Reflection Imaging
AI总结：
本文提出利用矩阵成像设计复数空间-时间聚焦定律，以优化反射成像中的分辨率并克服回声干扰。
摘要：
本文是关于利用斑点进行成像研究的三篇系列文章中的第三篇。在复杂介质中，一个基本限制是多重散射现象，它会完全模糊深度方向的成像过程。矩阵成像可以提供一个相关的框架来解决这个问题。正如它已被证明是探测斑点中回声的有效工具[ E. Giraudat 等，第一部分]，我们将展示它如何用于设计复数空间-时间聚焦定律，以监控多重反射路径与波场球面分量之间的干涉。为此，我们将畸变矩阵概念扩展到频域。然后，通过在时空傅里叶域中进行迭代相位反转过程，用于补偿回声并优化共聚焦图像的轴向和横向分辨率。在此，我们首先展示了一个实验概念验证，即通过一个回声板成像组织仿生假体，然后概述了这种策略在颅骨超声和更广泛领域中的潜力和局限性。
英文摘要：
This is the third article in a series of three dealing with the exploitation of speckle for imaging purposes. In complex media, a fundamental limit is the multiple scattering phenomenon that completely blurs the imaging process in depth. Matrix imaging can provide a relevant framework for solving this problem. As it proved to be an adequate tool for probing reverberations in speckle [E. Giraudat et al., Part I], we will show how it can be used to tailor complex spatio-temporal focusing laws to monitor the interference between the multiply-reflected paths and the ballistic component of the wave-field. To do so, we extend the distortion matrix concept to the frequency domain. An iterative phase reversal process operated from the space-time Fourier space is then used to compensate for reverberations and optimize both the axial and transverse resolution of the confocal image. Here, we first present an experimental proof-of-concept consisting in imaging a tissue-mimicking phantom through a reverberating plate before outlining the potential and the limits of this strategy for transcranial ultrasound and beyond.
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