Abstract
We present performance results for a prototype PET detector module consisting of 64 LSO scintillator crystals (3x3x20 mm) coupled on one end to a single photomultiplier tube and on the opposite end to a 64 pixel array of 3 mm square silicon photodiodes (typical pixel parameters are 5 pF capacitance, 300 pA dark current, and 73% quantum efficiency at 415 nm). The photomultiplier tube (PMT) provides an accurate timing pulse and energy threshold for all crystals in the module, the silicon photodiodes (PD) identify the crystal of interaction, the sum (PD+PMT) provides a total energy signal, and the PD/(PD+PMT) ratio determines the depth of interaction. With 32 of the channels instrumented, the detector module correctly identifies the crystal of interaction (where "correct" includes the adjacent 4 crystals) 79±4% of the time with high detection efficiency. The timing resolution for a single LSO detector module is 750 ps fwhm, while its pulse height resolution at 511 keV is 24±3% fwhm. The depth of interaction (DOI) measurement resolution is 8±1 mm fwhm.
| Original language | English |
|---|---|
| Pages (from-to) | 1197-1201 |
| Number of pages | 5 |
| Journal | IEEE Transactions on Nuclear Science |
| Volume | 44 |
| Issue number | 3 PART 2 |
| DOIs | |
| State | Published - 1997 |
| Externally published | Yes |
Funding
Energy under Contract No. DE-AC03-76SF00098, in part by Public Health Service Grant Nos. Pol-HL25840, R01-CA67911, and R01-NS29655, and in part by Breast Cancer Research Program of the University of California Grant No. 1RB-0068. We would like to thank Mr. Yamamoto of Hamamatsu Photonics for many interesting discussions, culminating with the photodiode array used herein. This work was supported in part by the Director, Office of Energy Research, Office of Health and Environmental Research, Medical Applications and Biophysical Research Division of the U.S. Department of Energy under contract No. DE-AC03-76SF00098, in part by the National Institutes of Health, National Heart, Lung, and Blood Institute, National Cancer Institute, and National Institute of Neurological Disorders and Stroke under grants No. Pol-HL25840, No. R01-CA67911, and No. R01-NS29655, and in part by the Breast Cancer Fund of the State of California through the Breast Cancer Research Program of the University of California under grant No. IRB-0068. Reference to a company or product name does not imply approval or recommendation by the University of California or the U.S. Department of Energy to the exclusion of others that may be suitable. * This work was supported in part by the U.S. Department of