Performance characteristics of a compact position-sensitive LSO detector module

The authors assembled a compact detector module comprised of an array of small, individual crystals of lutetium oxyorthosilicate:Ce (LSO) coupled directly to a miniature, metal-can, position-sensitive photomultiplier tube (PSPMT). The authors exposed this module to sources of 511-keV annihilation ra...

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Bibliographic Details
Published in:IEEE transactions on medical imaging 1998-12, Vol.17 (6), p.967-978
Main Authors: Vaquero, J.J., Seidel, J., Siegel, S., Gandler, W.R., Green, M.V.
Format: Article
Language:English
Subjects:
Assembly
Biological and medical sciences
Crystals
Detectors
Electromagnetic scattering
Energy measurement
Gain measurement
Investigative techniques, diagnostic techniques (general aspects)
Medical sciences
Miscellaneous. Technology
Particle scattering
Photomultipliers
Photonic crystals
Photosensitivity
Position measurement
Position sensitive particle detectors
Positron emission tomography
Radionuclide investigations
Scintillation
Sensor arrays
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Summary:The authors assembled a compact detector module comprised of an array of small, individual crystals of lutetium oxyorthosilicate:Ce (LSO) coupled directly to a miniature, metal-can, position-sensitive photomultiplier tube (PSPMT). The authors exposed this module to sources of 511-keV annihilation radiation and beams of 30- and 140-keV photons and measured spatial linearity; spatial variations in module gain, energy resolution, and event positioning; coincidence timing; the accuracy and sensitivity of identifying the crystal-of-first-interaction at 511 keV; and the effects of intercrystal scatter and LSO background radioactivity. The results suggest that this scintillator/phototube combination should be highly effective in the coincidence mode and can be used, with some limitations, to image relatively low-energy single photon emitters. Photons that are completely absorbed on their first interaction at 511 keV are positioned by the module at the center of a crystal. Intercrystal scatter events, even those that lead to total absorption of the incident photon, are placed by the module in a regular "connect-the-dot" pattern that joins crystal centers. As a result, the accuracy of event positioning can be made to exceed 90%, though at significantly reduced sensitivity, by retaining only events that occur within small regions-of-interest around each crystal center and rejecting events that occur outside these regions in the connect-the-dot pattern.
ISSN:0278-0062
1558-254X
DOI:10.1109/42.746629