title: A comparison of deconvolution and windowed subtraction techniques for scatter compensation in SPECT.
abstract: Three procedures for the removal of Compton-scattered data in SPECT by constrained deconvolution are presented. The first is a deconvolution of a 2-D measured PSRF containing scatter from a single reconstructed transaxial image; the second is a deconvolution of a 2-D measured point-source response function (PSRF) from each frame of projection data prior to reconstruction; the third involves deconvolution of a 3-D measured PSRF from a stack of reconstructed slices. Results of applying these procedures to data obtained from a phantom containing cold cylinders and to data from a cold spot-resolution phantom are presented and are shown to be superior to the results of correcting for scatter by scatter-window substraction. Both 3-D deconvolution from reconstructed images and 2-D deconvolution from projection data show major improvements in image contrast, resolution, and quantitation. Improvements are especially marked for small (1.0-3.0 cm) cold sources.
authors.affiliation: Dept. of Phys., Inst. of Cancer Res. and R. Marsden Hospital, Sutton.
authors.forename: J C
authors.initials: JC
authors.lastname: Yanch
authors.forename: M A
authors.initials: MA
authors.lastname: Flower
authors.forename: S
authors.initials: S
authors.lastname: Webb