A STATIONARY SAMPLING SCHEME FOR MULTILAYER POSITRON TOMOGRAPHS

Citation
M. Heon et al., A STATIONARY SAMPLING SCHEME FOR MULTILAYER POSITRON TOMOGRAPHS, IEEE transactions on medical imaging, 12(2), 1993, pp. 293-298
Citations number
23
Categorie Soggetti
Engineering, Biomedical","Radiology,Nuclear Medicine & Medical Imaging
ISSN journal
02780062
Volume
12
Issue
2
Year of publication
1993
Pages
293 - 298
Database
ISI
SICI code
0278-0062(1993)12:2<293:ASSSFM>2.0.ZU;2-6
Abstract
A stationary sampling scheme applicable to tomographic instruments inc orporating two or more detector layers is described and tested. In thi s concept, the detectors in adjacent layers are angularly offset by ha lf the interdetector distance. By reconstructing in one single slice a ll lines of response defined by two adjacent rings of detectors, a fou rfold increase in the number of coincidence lines is obtained and a un iform sampling distance equal to one-quarter the interdetector spacing is achieved. Whereas this is obtained at the expense of a 100 percent degradation of the resolution in the axial direction, with the recent breed of PET scanners using nearly square cross section detectors, th e resolution loss may be tolerable in many situations. In addition, no rmal reconstruction of the individual coincidence planes is always pos sible. The sampling concept was investigated experimentally with the h elp of the Universite de Sherbrooke PET camera simulator.