Title :
Singles transmission in positron emission tomography using 137 Cs
Author :
Karp, Joel S. ; Muehllehner, Gerd ; Smith, Robin
Author_Institution :
Dept. of Radiol., Pennsylvania Univ., Philadelphia, PA, USA
Abstract :
A singles transmission method of attenuation correction in PET has been developed, using a single-photon emitter, 137Cs, with an energy of 662 keV. The singles method can achieve a factor of ten in speed over the standard coincidence method, with comparable statistical quality and can enable post-injection transmission studies to be performed using energy discrimination to reject emission activity in the field-of-view. In order to compensate for the higher energy of the 137Cs source, the transmission images are segmented into tissue and lung compartments, and 511 keV attenuation coefficients are used. Segmentation also compensates for increased scatter with the singles method compared to the standard coincidence method, which takes advantage of a colinearity position gate
Keywords :
caesium; image segmentation; lung; medical image processing; positron emission tomography; 511 keV; 662 keV; 137Cs; Cs; PET; attenuation correction; colinearity position gate; energy discrimination; field-of-view; increased scatter; lung compartments; positron emission tomography; post-injection transmission studies; segmentation; single-photon emitter; singles transmission; speed; statistical quality; tissue; Attenuation; Detectors; Electromagnetic scattering; Event detection; Geometry; Image segmentation; Linearity; Particle scattering; Pollution measurement; Positron emission tomography;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference Record, 1995., 1995 IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-3180-X
DOI :
10.1109/NSSMIC.1995.500256
