Abstract

Measurements of photon migration through heterogeneous turbid media have been used for the construction of low-resolution images of spatially varying absorption and scattering factors within these media.¹ When the medium is dynamic, the time-dependent density fluctuations in the medium are impressed upon the temporal behavior of the diffusing light. For a homogeneous fluctuating turbid medium, such as a dense colloidal suspension, the temporal intensity autocorrelation of an emerging speckle can be analyzed to provide information about the density fluctuations within the sample.² In this paper we present experimental measurements of a heterogeneous fluctuating medium, i.e., a turbid medium with static and dynamic pieces, and we demonstrate that low-resolution images of spatially varying temporal density excitations may be derived from such measurements. Such images may enable experimenters to distinguish dynamic and static regions, within a highly scattering medium. such as calcium deposits and soft tissue.

© 1995 Optical Society of America