ITERATIVE RECONSTRUCTION METHODS FOR NONUNIFORM ATTENUATION DISTRIBUTION IN SPECT

Two iterative methods, a generalization of the Chang method and a proj ection precorrection, were investigated to determine whether the use o f an attenuation map could improve nonuniform attenuation compensation . After a detailed description of the methods, results obtained with s imulated and phantom data were compared. This study demonstrates that projection precorrection provides accurate quantification and good ima ge quality as early as the precorrection step, whereas the generalized Chang method requires computation of one more iteration.