DocumentCode :
1367317
Title :
Investigation of scatter in SPECT transmission studies
Author :
Celler, A. ; Axen, D.
Author_Institution :
Vancouver Hosp. & Health Sci. Centre, BC
Volume :
47
Issue :
3
fYear :
2000
fDate :
6/1/2000 12:00:00 AM
Firstpage :
1251
Lastpage :
1257
Abstract :
In simultaneous emission/transmission, scans photons spilling over from the higher to the lower energy window (cross-talk) are observed. The authors have evaluated the amount of cross talk scatter using data from several phantom and patient studies for different strengths of the Profile attenuation source. The quality of the resulting attenuation maps was assessed. In all studies the number of scattered photons which need to be subtracted from the transmission window by the cross-talk correction is 2 to 4 times larger than the number of true transmission photons. Using simulations the authors have studied the amount of scattered photons in transmission studies for different transmission source collimations, scan geometries and window energies. Although the total number of scattered transmission photons for 2D collimation, ranges from 5% to 26% of the primary photons for angles 1 to 10 degrees, their contribution to any particular energy window is much smaller, usually less then 1-2%. The authors´ conclusion from this study is that in order to minimize the cross-talk effect in simultaneous emission/transmission studies the energy of the transmission isotope should be higher than that of the emission isotope
Keywords :
gamma-ray scattering; single photon emission computed tomography; Profile attenuation source; SPECT transmission studies; attenuation maps quality; higher energy window; lower energy window; medical diagnostic imaging; nuclear medicine; scans photons spilling over; simultaneous emission/transmission; transmission isotope energy; true transmission photons; Attenuation; Electromagnetic scattering; Energy measurement; Hospitals; Isotopes; Nuclear medicine; Optical collimators; Particle scattering; Physics; Single photon emission computed tomography;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/23.856585
Filename :
856585
Link To Document :
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