Implementation of a model-based nonuniform scatter correction scheme for SPECT

IEEE Transactions on Medical Imaging
A Welch, G T Gullberg

Abstract

In this paper four scatter-compensation schemes are considered. The four schemes are all based on a previously developed two-dimensional (2-D) scatter model. Reconstruction is achieved using the iterative expectation-maximization maximum-likelihood (EM-ML) algorithm. The schemes consist of: 1) including the model in both the forward and back projector; 2) just including the model in the forward projector; 3) and 4) implementing the model in a subtraction and addition scheme, respectively. Monte Carlo simulated projection data are used to test the accuracy, convergence properties, and noise properties of the four scatter-compensation schemes. Data are simulated for both uniformly and nonuniformly attenuating objects. The results show that all four correction schemes yield images which are similar in terms of accuracy to that obtained from reconstructing scatter-free data. The subtraction scheme is shown to converge faster than the other compensation schemes, both in terms of iterations and actual time required for reconstruction. The scheme in which the model is only used in the forward-projector and the scatter-addition scheme both performs slightly better, in terms of signal-to-noise ratio (SNR), than the subtraction scheme. H...Continue Reading

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Citations

Jan 4, 2001·Computerized Medical Imaging and Graphics : the Official Journal of the Computerized Medical Imaging Society·L BouwensR A Dierckx
Sep 24, 2005·Physics in Medicine and Biology·Jinyi Qi, Ronald H Huesman
Jan 1, 2008·International Journal of Biomedical Imaging·Yan Yan, Gengsheng L Zeng
Mar 21, 2003·Applied Optics·Douglas A DegensteinNicholas D Lloyd
Oct 6, 2000·IEEE Transactions on Medical Imaging·G L Zeng, G T Gullberg
Mar 26, 2020·Physics in Medicine and Biology·Marlies C GoordenFreek J Beekman
Aug 4, 2005·Physics in Medicine and Biology·D LazaroI Buvat

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