DocumentCode :
462758
Title :
Evaluation of CT Field of View Restoration for PET-CT Attenuation Correction
Author :
Lonn, Albert ; Hsieh, Jiang ; Nyka, Mark
Author_Institution :
GE Healthcare, Waukesha, WI
Volume :
5
fYear :
2006
fDate :
Oct. 29 2006-Nov. 1 2006
Firstpage :
2759
Lastpage :
2760
Abstract :
The Discovery ST PET-CT scanner corrects the attenuation of the 511 keV PET emission using an attenuation map derived from a CT scan which is acquired with a 50 cm detector field of view. The PET scanner uses a 70 cm reconstruction field of view, and to support attenuation correction over the 70 cm diameter, the CT data are extended using a previously published method. The restored CT data have some errors in the extrapolated outline and the density in the extrapolated region, but the integral attenuation along the PET lines of response are restored with an acceptable error for the purpose of emission attenuation correction. The effect of the truncation on the reconstructed PET activity and the reduction in these effects with the restoration algorithm was measured using an active PET phantom. The use of the truncated attenuation map resulted in a loss of activity outside the truncated field of view and also had an effect on the activity within the 50 cm field of view. The use of the extrapolated CT images for attenuation correction results in a considerable improvement in the accuracy of the reconstructed activity.
Keywords :
computerised tomography; image reconstruction; phantoms; positron emission tomography; scattering; 511 keV; CT scan; PET-CT attenuation correction; PET-CT scanner; active PET phantom; detector field of view; emission attenuation correction; image reconstruction; restoration algorithm; truncated attenuation map; truncated field of view; Apertures; Attenuation; Computed tomography; Detectors; Image edge detection; Image reconstruction; Image restoration; Imaging phantoms; Plastics; Positron emission tomography;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium Conference Record, 2006. IEEE
Conference_Location :
San Diego, CA
ISSN :
1095-7863
Print_ISBN :
1-4244-0560-2
Electronic_ISBN :
1095-7863
Type :
conf
DOI :
10.1109/NSSMIC.2006.356450
Filename :
4179607
Link To Document :
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