Mesh model 2D reconstruction operator for SPECT

In this paper we extend our previous evaluation of 2D tomographic image reconstruction using a content-adaptive mesh model (CAMM) for emission tomography (EM). First we present a model for the projection operator calculation using a ray-tracing algorithm based on mesh modeling for image representation. The proposed calculation allows us to incorporate a non-uniform attenuation and distance-dependent spatial resolution of the imaging system. Next the proposed approach was tested using realistic simulations with the NCAT phantom and SIMIND Monte Carlo simulation of a SPECT system in which the mesh model is calculated using images from pre reconstruction by filtered-back projection. Thereby this paper establishes a necessary step for the future development of 3D reconstruction images and spatio-temporal processing using deformable mesh modeling.

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