Title :
Effects of axial transmission resolution in PET
Author :
Laymon, C.M. ; Turkington, T.G.
Author_Institution :
Dept. of Radiol., Duke Univ. Med. Center, Durham, NC, USA
Abstract :
The effects of the axial resolution of transmission projection data for use in PET attenuation correction is an important consideration for developing smoothing schemes for noise reduction and for the design of transmission systems. PET transmission data from 5 patient scans were used in conjunction with simulated uniform emission data to quantify some effects and to compare them to the effects of transaxial transmission smoothing. PET patient emission data were also corrected for attenuation using transmission projection data that had been smoothed axially or transaxially by various amounts. Results from the uniform emission studies show that the effects of axial transmission smoothing are always less than are those of transaxial smoothing. For example, within a volume that included the lungs, 50% of the voxels are inaccurate by more than 20% with a transmission axial filtering width of about 7 cm. For transaxial smoothing, the same level of inaccuracy is reached with a filter width of about 3 cm
Keywords :
gamma-ray absorption; image resolution; lung; medical image processing; positron emission tomography; 7 cm; PET attenuation correction; axial transmission resolution effects; filter width; medical diagnostic imaging; nuclear medicine; transaxial transmission smoothing; transmission systems design; uniform emission studies; Attenuation measurement; Biomedical imaging; Degradation; Filtering; Image resolution; Lesions; Noise reduction; Positron emission tomography; Radiology; Smoothing methods;
Conference_Titel :
Nuclear Science Symposium, 1999. Conference Record. 1999 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-5696-9
DOI :
10.1109/NSSMIC.1999.842783
