http://hdl.handle.net/2027.42/61182 2013-05-13T20:32:55Z http://hdl.handle.net/2027.42/86026 Improved Modeling of System Response in List Mode EM Reconstruction of Compton Scatter Camera Images Wilderman, S. J.; Fessler, Jeffrey A.; Clinthorne, N. H.; LeBlanc, J. W.; Rogers, W. L. 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 2001-02-01T00:00:00Z http://hdl.handle.net/2027.42/86030 Incorporation of System Resolution Compensation (RC) in the Ordered-Subset Transmission (OSTR) Algorithm for Transmission Imaging in SPECT Feng, Bing; Fessler, Jeffrey A.; King, Michael A. In order to reconstruct attenuation maps with improved spatial resolution and quantitative accuracy, we developed an approximate method of incorporating system resolution compensation (RC) in the ordered-subset transmission (OSTR) algorithm for transmission reconstruction. Our method approximately models the blur caused by the finite intrinsic detector resolution, the nonideal source collimation and detector collimation. We derived the formulation using the optimization transfer principle as in the derivation of the OSTR algorithm. The formulation includes one forward-blur step and one back-blur step, which do not severely slow down reconstruction. The formulation could be applicable to various transmission geometries, such as point-source, line-source, and sheet-source systems. Through computer simulations of the MCAT phantom and transmission measurements of the air-filled Data Spectrum Deluxe single photo emission computed tomography (SPECT) Phantom on a system which employed a cone-beam geometry and a system which employed a scanning-line-source geometry, we showed that incorporation of RC increased spatial resolution and improved the quantitative accuracy of reconstruction. In simulation studies, attenuation maps reconstructed with RC correction improved the quantitative accuracy of emission reconstruction. 2006-06-26T00:00:00Z http://hdl.handle.net/2027.42/86028 Improved Penalized Likelihood Reconstruction of Anatomically Correlated Mmission Data Titus, Stephen R.; Hero, Avred 0. III; Fessler, Jeffrey A. This paper presents a method for incorporating anatomical NMR boundary side information into penalized maximum likelihood (PML) emission image reconstructions. The NMR boundary is parameterized as a periodic spline curve of fixed order and number of knots that is known a priori. Maximum likelihood (ML) estimation of the spline coefficients yields an “extracted” boundary, which is used to define a set of Gibbs weights on the emission image space. These weights, when coupled with a quadratic penalty function, create an edge-preserving penalty that incorporates our prior knowledge effectively. Qualitative analysis demonstrates that our method results in smooth images that do not suffer loss of edge contrast, while quantitative estimates of bias and variance for various values of the smoothing parameter show an improvement over standard quadratically penalized maximum likelihood. 1996-09-16T00:00:00Z http://hdl.handle.net/2027.42/86027 Improved Modeling of System Response in List Mode EM Reconstruction of Compton Scatter Camera Images Wilderman, Scott J.; Fessler, Jeffrey A.; Clinthorne, Neal H.; Rogers, W. Les 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 some 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. Simulated projection data has been generated for a representative Compton camera system (CSPRINT) for several source distributions and reconstructions performed. Reconstructions have also been performed for experimental data for distributed sources. 1999-10-24T00:00:00Z