INVERSE MONTE CARLO: A UNIFIED RECONSTRUCTION ALGORITHM FOR SPECT.
Inverse Monte Carlo (IMOC) is presented as a unified reconstruction algorithm for Emission Computed Tomography (ECT) providing simultaneous compensation for scatter, attenuation, and the variation of collimator resolution with depth, The technique of inverse Monte Carlo is used to find an inverse solution to the photon transport equation (an integral equation for photon flux from a specified source) for a parametrized source and specific boundary conditions. While the present results specifically consider the reconstruction of camera-based Single Photon Emission Computed Tomographic (SPECT) images, the technique is equally valid for Positron Emission Tomography (PET) if a Monte Carlo model of such a system is used. As a preliminary evaluation, experimentally acquired SPECT phantom studies for imaging Tc-99m (140 kev) are presented which demonstrate the quantitative compensation for scatter and attenuation for a two dimensional (single slice) reconstruction.
Jr, CEF; Jaszczak, RJ; Coleman, RE
Ieee Transactions on Nuclear Science
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