Free-Form deformation in tomographic reconstruction. Application to attenuation map reconstruction.

We address the issue of using deformable models to reconstruct an unknown a ttenuation map of the torso from transmission scans. We focus on the recons truction of a piecewise-uniform attenuation coefficients distribution. We r epresent the unknown distribution by a set of closed surfaces defining regi ons having the same attenuating properties. We show how free-form,deformati ons allow one to deform a complex attenuation map template to match a set o f transmission scans. The deformability of the model and the accurate estim ation of the attenuating properties are closely studied in this paper.