DocumentCode :
469883
Title :
An optimized reprojection method with least angle-dependent error
Author :
Guedouar, Raja ; Zarrad, Boubaker
Author_Institution :
Higher Sch. of Health Sci. & Tech. of Monastir, Monastir
Volume :
5
fYear :
2007
fDate :
Oct. 26 2007-Nov. 3 2007
Firstpage :
3904
Lastpage :
3907
Abstract :
Methods for computing forward projection such ray-driven, pixel-driven, distance-driven or their interpolated versions, result in varying degrees of angular-dependent errors. New optimized reprojection methods have been developed for use in single photon emission computed tomography (SPECT) with parallel-beam geometry, which provide superior corrections of these errors. These methods are based on a comparative angular study between various conventional reprojection methods. This optimization is based on a selection of the operator which provides the minimum of errors for a given projection angle. This method was compared to the conventional methods using the digital Shepp-Logan phantom. The normalized mean square error, the normalized mean error and the max percent error between reprojected sinograms and a standard reference were calculated. Results show that the proposed operators have at least comparable performance. This work also investigates a comparative study on iterative reconstruction task with ML-EM. The preliminary result of this study shows that these optimized reprojection operators can promise more accuracy of reconstructed images.
Keywords :
expectation-maximisation algorithm; image reconstruction; mean square error methods; medical image processing; optimisation; phantoms; single photon emission computed tomography; SPECT; Shepp-Logan phantom; error correction; iterative reconstruction; least angle-dependent error; max percent error; maximum likelihood expectation maximisation method; normalized mean error; normalized mean square error; optimization; optimized reprojection method; parallel-beam geometry; single photon emission computed tomography; Analytical models; Computational geometry; Error correction; Image reconstruction; Image sampling; Imaging phantoms; Mean square error methods; Nuclear and plasma sciences; Optimization methods; Single photon emission computed tomography;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium Conference Record, 2007. NSS '07. IEEE
Conference_Location :
Honolulu, HI
ISSN :
1095-7863
Print_ISBN :
978-1-4244-0922-8
Electronic_ISBN :
1095-7863
Type :
conf
DOI :
10.1109/NSSMIC.2007.4436971
Filename :
4436971
Link To Document :
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