DocumentCode :
2001987
Title :
Combined fan/parallel beam reconstruction in cardiac SPECT imaging
Author :
Narayanan, M.V. ; King, Michael A. ; Byrne, Charles L.
Author_Institution :
Massachusetts Univ. Med. Center, Worcester, MA, USA
Volume :
3
fYear :
1999
fDate :
1999
Firstpage :
1142
Abstract :
With three-headed SPECT systems, two heads can aquire truncation-free emission images with parallel-beam (PB) collimators, while the third head acquires transmission images through a fan-beam (FB) collimator. The FB collimator can also be used for emission imaging. Combining FB and PB emission data from the 3 heads, offers the potential for improved sensitivity with the trade-off being truncation artifacts. In this work, the authors investigate 3 methods to combine fan and parallel beam (F&PB) reconstructions. The first approach uses a PB estimate as a prior for the regularized AB-EMML algorithm to reduce truncation in the FB reconstruction. The second approach combines the parallel and re-sorted FB projections and reconstructs a composite image. The third method is based on the work of Jasczak el al. (Phys. Med. Biol., vol. 37, p. 535-48, 1992) where the intermediate F&PB reconstructions are combined to reduce the truncation artifacts inherent In FB imaging. MCAT simulation results indicate that the combined F&PB reconstructions provide decreased image noise while greatly limiting the truncation artifacts inherent in FB imaging
Keywords :
cardiology; image reconstruction; medical image processing; single photon emission computed tomography; cardiac SPECT imaging; combined fan/parallel beam reconstruction; composite image; decreased image noise; improved sensitivity; medical diagnostic imaging; nuclear medicine; three-headed SPECT systems; transmission images; truncation artifacts; truncation-free emission images; Attenuation; Collimators; Geometry; Image reconstruction; Imaging phantoms; Maximum likelihood detection; Maximum likelihood estimation; Noise level; Torso; Upper bound;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium, 1999. Conference Record. 1999 IEEE
Conference_Location :
Seattle, WA
ISSN :
1082-3654
Print_ISBN :
0-7803-5696-9
Type :
conf
DOI :
10.1109/NSSMIC.1999.842762
Filename :
842762
Link To Document :
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