论文标题
向后传播
Backward Propagation
论文作者
论文摘要
该文档涵盖了向后传播的基本算法，从成像系统中的“屏幕”捕获的波场的观点。由于Helmholtz方程的特性，波场具有固有的传播对称性，可以利用图像形成。在该主题的传统演讲中，这种“互惠”与重建程序之间的联系仅在直观的层面上进行动机。我建议通过使用一种称为“平面到平面”传播的技术使其更加严格，该技术在更高级的设置中也称为“光束传播方法”。
The document covers the fundamental algorithm of backward propagation from the point of view of reconstructing the wavefield captured by a "screen" in an imaging system. Owing to a property of the Helmholtz equation, wavefields have an inherent propagation symmetry which can be exploited for image formation. In traditional presentations of this topic the link between this "reciprocity" and the reconstruction procedure are motivated only at an intuitive level. I propose to make this more rigorous by using a technique called "plane-to-plane" propagation which is also known as "beam propagation method" in more advanced settings.
