Light Propagation in Tissue

摘要: From the point of view biomedical applications, propagation light in biological tissues is a combination good news and bad news. The that tissue highly translucent, allowing to penetrate far inside. This property has been experienced by anyone who covered flashlight with their hand at night seen it glow red. heterogeneous, distorting wave fronts scattering many directions. when trying see splinter lodged just below surface skin where shows up as dim blur. news/bad core clear split optical behavior tissue. Image-bearing light, also called ballistic or coherent attenuated rapidly propagates Yet scattered photons continue scatter transport across large distances. image-bearing can be accessed imaging applications using coherence detector (interferometry holography) micron-scale resolution millimeter inside On other hand, diffusing utilized solving diffusion equation reconstructing objects centimeters Between these two methods, there trade-off between depth penetration spatial resolution. Coherent provide cellular resolution, but only near surface. Diffusing provides coarse imaging, penetrates deep