DocumentCode :
1417488
Title :
Slab-by-slab blurring model for geometric point response correction and attenuation correction using iterative reconstruction algorithms
Author :
Bai, Chuanyong ; Zeng, Gengsheng L. ; Gullberg, Grant T. ; DiFilippo, Frank ; Miller, Steven
Author_Institution :
Dept. of Radiol., Utah Univ., Salt Lake City, UT, USA
Volume :
45
Issue :
4
fYear :
1998
fDate :
8/1/1998 12:00:00 AM
Firstpage :
2168
Lastpage :
2173
Abstract :
The distance-dependent geometric point response of a single photon emission computed tomography (SPECT) system and the attenuation effect of photons passing through the object are modeled in an iterative OS-EM reconstruction algorithm to improve both the resolution and quantitative accuracy of the reconstructed images. A specified number of neighboring vertical slices are grouped into a slab, and an efficient incremental slab-by-slab blurring model is introduced to accelerate the reconstruction. The advantage of the slab-by-slab blurring model over the slice-by-slice model is that the computational time is reduced, while still maintaining the spatial resolution and quantitative accuracy of the reconstructed images. The application of this incremental slab-by-slab blurring model with a slice-by-slice attenuation model to the image reconstruction of phantom, Monte Carlo simulated SPECT data, and patient data shows improved resolution and contrast over the images reconstructed without the corrections. The reconstruction is accelerated by a factor of about 1.4, and the projection/backprojection operation is accelerated by a factor of about 5, using the slab-by-slab convolution implementation with 8 slices in a slab compared with the slice-by-slice convolution implementation
Keywords :
Monte Carlo methods; image reconstruction; image resolution; iterative methods; medical image processing; modelling; single photon emission computed tomography; Monte Carlo simulated SPECT data; SPECT system; attenuation correction; contrast improvement; geometric point response correction; iterative reconstruction algorithms; medical diagnostic imaging; nuclear medicine; quantitative accuracy improvement; slab-by-slab blurring model; slice-by-slice convolution implementation; spatial resolution; Acceleration; Attenuation; Convolution; Image reconstruction; Image resolution; Reconstruction algorithms; Single photon emission computed tomography; Slabs; Solid modeling; Spatial resolution;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/23.708334
Filename :
708334
Link To Document :
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