title: Development of a Cost-Effective Modular Pixelated NaI(Tl) Detector for Clinical SPECT Applications.
abstract: A new pixelated detector for high-resolution clinical SPECT applications was designed and tested. The modular detector is based on a scintillator block comprised of 2.75×2.75×10 mm3NaI(Tl) pixels and decoded by an array of 51 mm diameter single-anode PMTs. Several configurations, utilizing two types of PMTs, were evaluated using a collimated beam source to measure positioning accuracy directly. Good pixel separation was observed, with correct pixel identification ranging from 60 to 72% averaged over the entire area of the modules, depending on the PMT type and configuration. This translates to a significant improvement in positioning accuracy compared to continuous slab detectors of the same thickness, along with effective reduction of "dead" space at the edges. The observed 10% average energy resolution compares well to continuous slab detectors. The combined performance demonstrates the suitability of pixelated detectors decoded with a relatively small number of medium-sized PMTs as a cost-effective approach for high resolution clinical SPECT applications, in particular those involving curved detector geometries.
authors.affiliation: Department of Diagnostic Radiology, Rush University Medical Center, Chicago, IL 60612 USA.
authors.forename: Mike
authors.initials: M
authors.lastname: Rozler
authors.forename: Haoning
authors.initials: H
authors.lastname: Liang
authors.forename: Wei
authors.initials: W
authors.lastname: Chang
keywords: Biomedical imaging; gamma camera; single photon emission computed tomography