2001/02/01 by S.J. Wilderman, Jeffrey A. Fessler, J.A. Fessler +3
Medicine · Physics and Astronomy · #Advanced MRI Techniques and Applications #Medical Imaging Techniques and Applications #Radiation Detection and Scintillator Technologies
paper · doi:10.1109/23.910840
crossref issued 2001/02/01 · crossref published 2001/02/01 · crossref published-print 2001/02/01 · openalex publication_date 2001/02/01 · crossref created 2002/08/24 · crossref deposited 2021/11/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26 · crossref indexed 2026/07/29
An improved List Mode EM method for reconstructing Compton scattering camera images has been developed. First, an approximate method for computation of the spatial variation in the detector sensitivity has been derived and validated by Monte Carlo computation. A technique for estimating the relative weight of system matrix coefficients for each gamma in the list has also been employed, as has a method for determining the relative probabilities of emission having come from pixels tallied in each list-mode back-projection. Finally, a technique has been developed for modeling the effects of Doppler broadening and finite detector energy resolution on the relative weights for pixels neighbor to those intersected by the back-projection, based on values for the FWHM of the spread in the cone angle computed by Monte Carlo. Memory issues typically associated with list mode reconstruction are circumvented by storing only a list of the pixels intersected by the back-projections, and computing the weights of the neighboring pixels at each iteration step. Reconstructions have been performed on experimental data for both point and distributed sources.