title: Maximum-likelihood Estimation of 3D Event Position in Monolithic Scintillation Crystals: Experimental Results.
abstract: We present a simple 3D event position-estimation method using raw list-mode acquisition and maximum-likelihood estimation in a modular gamma camera with a thick (25mm) monolithic scintillation crystal. This method involves measuring 2D calibration scans with a well-collimated 511 keV source and fitting each point to a simple depth-dependent light distribution model. Preliminary results show that angled collimated beams appear properly reconstructed.
authors.affiliation: Biomedical Engineering Program, the Department of Radiology and the College of Optical Sciences, University of Arizona, Tucson, AZ 85724 USA.
authors.forename: S K
authors.initials: SK
authors.lastname: Moore
authors.affiliation: Biomedical Engineering Program, the Department of Radiology and the College of Optical Sciences, University of Arizona, Tucson, AZ 85724 USA.
authors.forename: W C J
authors.initials: WC
authors.lastname: Hunter
authors.affiliation: Biomedical Engineering Program, the Department of Radiology and the College of Optical Sciences, University of Arizona, Tucson, AZ 85724 USA.
authors.forename: L R
authors.initials: LR
authors.lastname: Furenlid
authors.affiliation: Biomedical Engineering Program, the Department of Radiology and the College of Optical Sciences, University of Arizona, Tucson, AZ 85724 USA.
authors.forename: H H
authors.initials: HH
authors.lastname: Barrett
keywords: Depth of interaction (DOI); Emission tomography; PET; SPECT; gamma camera; gamma ray; maximum likelihood; monolithic scintillation crystal