Abstract

When an object is placed in a highly scattering medium, ballistic light transport from the object to a detector is nearly absent. Direct imaging of the object is impossible and other methods should be used. There are important medical applications like location of those tumour cells in the human tissue which cannot be seen with conventional techniques. As a first step to solve the problem of imaging through scattering media, one could by to reduce the multiple-scattering contribution to the image either by making the media absorb, or by filtering out the lowest order of scattering with the help of femto-second light pulses and ultra-fast detection methods. By these methods only the non-multiple scattered light is detected, therefore high intensities for the incoming light are necessary and an exponential decay of the signal with increasing distance between the object and boundaries of the scattering medium is to be expected. This puts a serious limit on the probing depth.

© 1992 IQEC