Title :
Segmented attenuation correction for PET
Author :
Fessler, Jeffrey A.
Author_Institution :
Div. of Nucl. Med., Michigan Univ., Ann Arbor, MI, USA
Abstract :
The authors describe a hybrid measured/calculated method for attenuation correction in positron emission tomography (PET). This unified reconstruction/segmentation method is based on a penalized weighted least-squares objective function that is minimized using iterative coordinate-descent. Two penalty functions are compared: one for a discrete object parameterization, the other for a continuous parameterization. Simulations demonstrate that the methods can reduce the additional emission image variance typically introduced by noisy attenuation correction factors
Keywords :
computerised tomography; medical image processing; radioisotope scanning and imaging; simulation; additional emission image variance; continuous parameterization; discrete object parameterization; hybrid measured/calculated method; iterative coordinate-descent; noisy attenuation correction factors; penalized weighted least-squares objective function; penalty functions; positron emission tomography; segmented attenuation correction; simulations; unified reconstruction/segmentation method; Attenuation measurement; Image reconstruction; Image segmentation; Iterative methods; Noise reduction; Nuclear measurements; Nuclear medicine; Positron emission tomography; Redundancy; Smoothing methods;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0884-0
DOI :
10.1109/NSSMIC.1992.301040
