Others have reported the use of position-sensitive photomultiplier
tubes (PSPMTs) coupled to scintillator arrays to construct
high resolution compact gamma cameras [14], [15]. In our application,
to image the bio-distribution of ligands labeled with
I-125 in the animal under study we anticipate being able to employ
two different sets of gamma-ray imaging detectors based
on PSPMTs coupled to crystal scintillator arrays. One set is
based on three 1 inch square Hamamatsu R5900-M64 PSPMTs
and the other makes use of two 5 inch diameter Hamamatsu
R3292 PSPMTs. The X-ray radiographic projections are obtained
using a LIXI Inc. model LF-85-503-OS X-ray imaging
system that has an active area of 5.5 cm in diameter. SPECT
reconstruction results using the R5900 based detector are presented
for two phantom studies.
II. DETECTOR