Title :
Attenuation correction in 3D PET-comparison of the direct and the reconstruction-reprojection method
Author :
Beyer, Thomas ; Townsend, David W. ; Defrise, Michel
Author_Institution :
Leipzig Univ., Germany
fDate :
31 Oct-6 Nov 1993
Abstract :
Two methods for attenuation correction in 3D positron emission tomography have been compared. The first method, which is referred to here as the direct method, estimates the attenuation correction factors from the ratio of the blank and transmission scan. The second method, referred to here as the reconstruction-reprojection method is based on the reconstruction and forward projection of a transmission image. Using computer simulation, it is shown that the reconstruction-reprojection method significantly increases the signal-to-noise ratio in the corrected 3D emission scan, but leads to only a limited improvement in the image. A similar image signal-to-noise ratio can be obtained using the direct method, if the transmission scan is first convolved with a 3-point smoothing window. The consequence of the loss of resolution caused by this smoothing is analysed using a simulated chest phantom
Keywords :
medical image processing; positron emission tomography; 3-point smoothing window; 3D PET attenuation correction; attenuation correction factors; blank scan; computer simulation; diagnostic nuclear medicine; direct method; medical diagnostic imaging; reconstruction-reprojection method; resolution loss; signal-to-noise ratio; simulated chest phantom; smoothing; transmission scan; Attenuation; Computer simulation; Image edge detection; Image reconstruction; Imaging phantoms; Positron emission tomography; Signal resolution; Signal to noise ratio; Smoothing methods; Spatial resolution;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1993., 1993 IEEE Conference Record.
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-1487-5
DOI :
10.1109/NSSMIC.1993.373523