EXPERIMENTAL IMAGES OF HETEROGENEOUS TURBID MEDIA BY FREQUENCY-DOMAINDIFFUSING-PHOTON TOMOGRAPHY

We present images of heterogeneous turbid media derived from measureme nts of diffuse photon-density waves traveling through highly scatterin g tissue phantoms. To our knowledge, the images are the first experime ntal reconstruction based on data collected in the frequency domain. W e demonstrate images of both absorbing and scattering heterogeneities and show that this method is sensitive to the optical properties of th e heterogeneity. The algorithm employs a differential measurement sche me that reduces the effect of errors resulting from incorrect estimati on of the background optical properties. The relative advantages of so urces with low and high modulation frequency are discussed within this context.