In this work, we present experiments which illustrate the properties of diffuse photon density waves. Our observations demonstrate the manipulation of these waves by adjustment of the photon diffusion coeficients of adjacent media. The waves are imaged, and are shown to obey simple relations such as Snell's Law. Diffusing photons can be used to detect, localize and characterize optical and dynamical spatial inhomogeneities embedded in turbid media. Measurements of the intensity of diffuse photons reveal information about the optical properties of a system.
Speckle fluctuations carry information about the dynamical and optical properties.
This dissertation shows that simple diffusion theories accurately model the intensity and speckle correlation signals that diffuse through turbid media with spatially varying properties and discusses possible biomedical applications. The programs can therefore be executed on a variety of computers. Dynamic data allocation is used for mcml, hence the number of tissue layers and the number of grid elements of the grid system can be varied by users at run time as long as the total amount of memory does not exceed what the system allows. The principle and the implementation details of the model, and the instructions for using mcml and conv, are presented here. We have verified some of the mcml and conv computation results with those of other theories or other investigators.