We discuss the relationship among various theories that have been presented to describe light diffusion in turbid medium such as tissues,and indicate the usefulness and limitations of these theories.

• 首先,概述了描述光子在混浊介质中传输的各种理论,不同理论间的相互关系及适用范围。随后,介绍了适用于大组织的扩散理论及基于扩散理论的时域和频域技术。