Title :
Joint estimation of the activity and the events of interaction in SPECT systems
Author :
Pedemonte, Stefano ; Arridge, Simon ; Hutton, Brian F. ; Ourselin, Sebastien
Author_Institution :
Centre for Med. Image Comput., Univ. Coll. London, London, UK
fDate :
Oct. 27 2012-Nov. 3 2012
Abstract :
We describe a unified probabilistic graphical model for joint reconstruction of the activity and of the coordinates of the events of interaction in Emission Imaging. This new formulation is a discrete-discrete alternative to the discretecontinuous List Mode Likelihood model described by Barrett et at. The discrete-discrete formulation allows us to account for nonhomogeneous resolution of the gamma-camera while adopting computationally efficient shift-invariant projection and backprojection algorithms. We describe an application of the model for the compensation of disrupted photo-detectors is SPECT.
Keywords :
collimators; gamma-ray apparatus; photodetectors; single photon emission computed tomography; solid scintillation detectors; SPECT systems; back-projection algorithms; collimator; discrete-continuous list mode likelihood model; discrete-discrete formulation; emission imaging; gamma-camera; nonhomogeneous resolution; photodetectors; scintillator crystal; shift-invariant projection; unified probabilistic graphical model;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE
Conference_Location :
Anaheim, CA
Print_ISBN :
978-1-4673-2028-3
DOI :
10.1109/NSSMIC.2012.6551774
