DocumentCode :
1622062
Title :
Projection space image reconstruction using strip functions to calculate pixels more “natural” for modeling the geometric response of the SPECT collimator
Author :
Hsieh, Yu-Lung ; Zeng, Gengsheng L. ; Gullberg, Grant T.
Author_Institution :
Dept. of Radiol., Utah Univ., Salt Lake City, UT, USA
Volume :
3
fYear :
1996
Firstpage :
1668
Abstract :
The spatially varying geometric response of the collimator-detector system in SPECT produces loss in resolution in addition to shape distortions, reconstructed density non-uniformity and quantitative inaccuracies. A projection space image reconstruction with projectors that use strip functions to calculate pixels more “natural” for modeling the geometric response of the SPECT collimator is used to correct these reconstruction artifacts. Two projection models were evaluated for modeling the system geometric response function. For one projector each strip is of equal weight, whereas for the other a Gaussian weighting is used. Fan beam projection of a physical Hoffman brain phantom was used to evaluate the geometric response correction. Reconstructions produced by the two proposed projectors showed improved resolution when compared against a unit-strip “natural” pixel model and the filtered backprojection algorithm
Keywords :
brain; filtering theory; gamma-ray apparatus; gamma-ray detection; image reconstruction; image resolution; medical image processing; single photon emission computed tomography; Gaussian weighting; SPECT collimator; collimator-detector system; equal weight; fan beam projection; filtered backprojection algorithm; geometric response function; geometric response modeling; more natural pixels; physical Hoffman brain phantom; projection models; projection space image reconstruction; quantitative inaccuracies; reconstructed density nonuniformity; reconstruction artifacts; resolution loss; shape distortions; spatially varying geometric response; strip functions; unit-strip natural pixel model; Image reconstruction; Image resolution; Optical collimators; Photonic crystals; Pixel; Shape; Solid modeling; Solid scintillation detectors; Spatial resolution; Strips;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium, 1996. Conference Record., 1996 IEEE
Conference_Location :
Anaheim, CA
ISSN :
1082-3654
Print_ISBN :
0-7803-3534-1
Type :
conf
DOI :
10.1109/NSSMIC.1996.587947
Filename :
587947
Link To Document :
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