title: An EM algorithm for dynamic SPECT.
abstract: In this paper we present two variants of the EM algorithm for dynamic SPECT imaging. A version based on compartmental modeling which fits a sum of exponentials and a more general approach allowing for arbitrary decaying activities. The underlying probabilistic models are discussed and the incomplete and complete data spaces are shown to be physically meaningful. We indicate that the second method, leading to a convex program in the M step, is easier to treat numerically and we present a possible numerical approach. Some preliminary numerical tests indicating the feasibility of the method are included.
authors.affiliation: University of Waterloo, Department of Combinatorics and Optimization, ON, Canada.
authors.forename: H H
authors.initials: HH
authors.lastname: Bauschke
authors.forename: D
authors.initials: D
authors.lastname: Noll
authors.forename: A
authors.initials: A
authors.lastname: Celler
authors.forename: J M
authors.initials: JM
authors.lastname: Borwein
mesh_terms: D000465:Algorithms; D006801:Humans; D015233:Models, Statistical; D015203:Reproducibility of Results; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods*