Publication: Performance characteristics of a compact position-sensitive LSO detector module
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1998-12
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Tutors
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IEEE
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Abstract
We 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).We 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.
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Keywords
Intercrystal scatter, Lutetium oxyorthosilicate:Ce (LSO), Position-sensitive photomultiplier tubes, Small animal positron emission tomography (PET)
Bibliographic citation
IEEE Transactions on Medical Imaging, vol. 17, n. 6, dec. 1998. Pp. 967-978