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					      Using angle data in diffuse optical tomography
                               Arnold Kim
                      University of California, Merced

                            October 30, 2006



    We discuss the inverse obstacle scattering problem for diffuse optical to-
mography in a half-space and a slab. We model the obstacle by an absorption
heterogeneity. When measurements at the boundary include variations in an-
gle of detection, we derive a reduced problem by removing surface sources
explicitly. This reduced problem is more suitable than the original problem
for several different approximations in the literature.




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