IMAGING WITHIN HIGHLY SCATTERING MEDIA USING TIME-RESOLVED BACKSCATTERING OF FEMTOSECOND PULSES

Small objects embedded in highly scattering media are traced down and depicted by gated detection of backscattered light. Using a mode-locke d Ti:sapphire laser as an illuminating and gating light source, a dept h resolution of about 10 mu m can be obtained. In media with scatterin g properties similar to those of human skin, embedded metallic objects are imaged up to depths of 1.2 mm and, over the same range of depth, the inhomogeneous scattering parameters of porcine skin are recordable .