Title :
A new stationary sampling scheme for multi-layer positron tomographs
Author :
Héon, M. ; Carrier, C. ; Cadorette, J. ; Richard, P. ; Rouleau, D. ; Rodrigue, S. ; Lecomte, R.
Author_Institution :
Dept. of Nucl. Med. & Radiobiol., Sherbrooke Univ., Que., Canada
Abstract :
A stationary sampling scheme applicable to tomographic instruments incorporating two or more detector layers is described. In this concept, the detectors in adjacent layers are angularly offset by half the interdetector distance. By reconstructing in one single slice all lines of response defined by two adjacent rings of detectors, a fourfold increase in the number of coincidence lines is obtained and a uniform sampling distance equal to one quarter the interdetector spacing is achieved. Whereas this is obtained at the expense of a 100% degradation of the resolution in the axial direction, with the recent breed of PET (positron emission tomography) scanners using nearly square cross section detectors the resolution loss is tolerable; in addition, normal reconstruction of the individual coincidence planes is always possible. The new sampling concept was investigated experimentally with a PET camera simulator. Results obtained by simulating the proposed scheme confirmed the improvement in transaxial imaging performance.<>
Keywords :
computerised tomography; radioisotope scanning and imaging; PET; coincidence lines; interdetector spacing; medical diagnostic imaging; multi-layer positron tomographs; nuclear medicine; resolution degradation; stationary sampling scheme; tomographic instruments; transaxial imaging performance; uniform sampling distance; Cameras; Crystals; Detectors; Graphics; Instruments; Motion detection; Nuclear medicine; Positron emission tomography; Sampling methods; Spatial resolution;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE
Conference_Location :
Santa Fe, NM, USA
Print_ISBN :
0-7803-0513-2
DOI :
10.1109/NSSMIC.1991.259190
