Title :
SPRINT II: a second generation single photon ring tomograph
Author :
Rogers, W.L. ; Clinthorne, N.H. ; Shao, L. ; Chiao, P. ; Ding, Y. ; Stamos, J.A. ; Koral, K.F.
Author_Institution :
Michigan Univ. Med. Center, Ann Arbor, MI, USA
Abstract :
SPRINT II is a stationary detector ring tomograph designed for brain imaging. Eleven two-dimensional sodium iodide camera modules that use maximum-likelihood position logic are arranged in a 50-cm-diameter ring with a scintillator packing fraction of 96%. A 34-cm-diameter rotating lead aperture ring containing either 10 or 12 slits is used for in-plane collimation, while the z-axis collimator is constructed of parallel lead foil rings. The field of view is 22 cm in diameter by 12 cm long. Sensitivity is 10 count/s/ mu Ci for an on-axis /sup 99m/Tc point source and 8500 count/s/ mu Ci/cm/sup 3/ for 19.8-cm-diameter by 6.2-cm-long cylindrical source. Longitudinal resolution is 10 mm FWHM, and in-plane resolution varies from 8 mm FWHM on-axis to 5 mm FWHM at a radius of 9 cm. Performance results are presented.<>
Keywords :
biomedical equipment; computerised tomography; /sup 99/Tc point source; NaI; SPRINT II; brain imaging; cylindrical source; longitudinal resolution; maximum-likelihood position logic; medical instrumentation; parallel Pb foil rings; scintillator packing fraction; second generation single photon ring tomograph; z-axis collimator; Apertures; Brain; Collimators; Detectors; Geometry; High-resolution imaging; Instruments; Optical imaging; Prototypes; Single photon emission computed tomography;
Journal_Title :
Medical Imaging, IEEE Transactions on
