Title :
Optimizing rod window width in positron emission tomography
Author :
Jones, W.F. ; Digby, W.M. ; Luk, W.K. ; Casey, M.E. ; Byars, L.G.
Author_Institution :
CTI PET Syst. Inc., Knoxville, TN, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
A technique determines the optimal window width for orbiting rod transmission studies in positron emission tomography (PET). Windowing reduces noise in orbiting rod transmission studies. Lines-of-response (LOR) which intersect the rods generate primarily true coincidence events. LOR which pass far from the rods generate random and scatter events. Since the angular position of the orbiting rods is known in real-time, LOR which produce mostly noise are gated off. When optimally determined, the rod window width maximizes the noise equivalent counts (NEC) collected in the transmission study. Transaxial rod projection profiles of trues, randoms, and scatter produce NEC versus window width plots. For the ECAT EXACT line of PET systems and a 20-cm water cylinder, optimal is five LOR wide
Keywords :
positron emission tomography; 20 cm; 20-cm water cylinder; ECAT EXACT PET systems line; lines-of-response; medical diagnostic imaging; noise equivalent counts maximization; nuclear medicine; random events; rod window width optimization; scatter events; transaxial rod projection profiles; true coincidence events; Attenuation measurement; Delay; Extraterrestrial measurements; Hardware; National electric code; Noise measurement; Noise reduction; Positron emission tomography; Radioactive decay; Scattering;
Journal_Title :
Medical Imaging, IEEE Transactions on
