Method and system for imaging objects in turbid media using diffusive fermat photons

摘要

A method for imaging objects in turbid media. According to one embodiment of the invention, the method comprises the steps of (a) illuminating the object through the turbid medium with a pulse of light, the light emergent from the turbid medium consisting of a ballistic component, a snake-like component and a diffusive component, the diffusive component including Fermat photons and non-Fermat photons; (b) gating the light emergent from the turbid medium to preferentially select Fermat photons; and (c) forming an image of the object using the gated light. Preferably, a spatial gate is used to preferentially select Fermat photons from the emergent light. This may be done by orienting the source of the illuminating light and a light detector to lie along a most favorable path travelled predominately by Fermat photons. A time gate, such as a streak camera or the like, may be used in addition to the spatial gate to more carefully select Fermat photons from the emergent light. The above-described method may also be used to produce a tomography map of a turbid medium for use in detecting an object located within the turbid medium. This may be done, for example, by providing two or more pairs of light sources and light detectors which are arranged to provide intersecting most favorable paths. The present invention is also directed to systems constructed in accordance with the foregoing methods.