Abstract: A study has been performed of the image contrast produced by small spheres embedded in a homogenous highly scattering medium. The scattering medium consisted of a suspension of uniform latex microspheres, and the spheres situated at various depths in the medium were either transparent or totally opaque. The imaging technique involved measuring and discriminating between the flight times of transmitted photons. The principal components of the imaging system are a picosecond laser and a streak camera. A beam of pulses was translated in two dimensions across a vertical surface of the medium while the camera measured the temporal distribution of light collected from a point on the opposite surface. Images are presented which were generated using transmitted light integrated over steadily increasing periods of time. The contrast produced by each type of sphere was evaluated as a function of the period of time over which the transmitted light was integrated. !13
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