RT Journal Article
T1 Performance characteristics of a compact position-sensitive LSO detector module
A1 Vaquero López, Juan José
A1 Seidel, Jürgen
A1 Siegel, Stefan
A1 Gandler, William R.
A1 Green, Michael V.
AB We assembled a compact detector module comprisedof 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 thismodule to sources of 511-keV annihilation radiation and beamsof 30- and 140-keV photons and measured spatial linearity;spatial variations in module gain, energy resolution, and eventpositioning; coincidence timing; the accuracy and sensitivity ofidentifying the crystal-of-first-interaction at 511 keV; and theeffects of intercrystal scatter and LSO background radioactivity.The results suggest that this scintillator/phototube combinationshould be highly effective in the coincidence mode and can beused, with some limitations, to image relatively low-energy singlephoton emitters.Photons that are completely absorbed on their first interactionat 511 keV are positioned by the module at the center of acrystal. Intercrystal scatter events, even those that lead to totalabsorption of the incident photon, are placed by the module in aregular “connect-the-dot” pattern that joins crystal centers. As aresult, the accuracy of event positioning can be made to exceed90%, though at significantly reduced sensitivity, by retainingonly events that occur within small regions-of-interest aroundeach crystal center and rejecting events that occur outside theseregions in the connect-the-dot pattern.
PB IEEE
SN 0278-0062
YR 1998
FD 1998-12
LK https://hdl.handle.net/10016/14551
UL https://hdl.handle.net/10016/14551
LA eng
NO The work was supported in part by a grant from CICYT (Spanish Government). The work of S. Siegel was supported by a grant from the National Research Council.
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