This work extends modulated imaging, a recently developed technique based on the projection of structured light on a turbid medium that is able to measure optical properties of the high-scattering medium and perform tomography. We observe that structured light obliquely projected on a turbid medium undergoes a spatial shift during propagation. We propose a method to measure the spatial phase shift of a sinusoidal fringe pattern projected in a turbid medium, and we present a model derived from the diffusion approximation to describe the light propagation. Experimental validation by measurements performed on liquid phantoms is presented.
© 2008 Optical Society of America
Original Manuscript: July 22, 2008
Revised Manuscript: September 9, 2008
Manuscript Accepted: September 9, 2008
Published: October 23, 2008
Vol. 4, Iss. 1 Virtual Journal for Biomedical Optics
Andrea Bassi, David J. Cuccia, Anthony J. Durkin, and Bruce J. Tromberg, "Spatial shift of spatially modulated light projected on turbid media," J. Opt. Soc. Am. A 25, 2833-2839 (2008)