LGSO scintillation crystals coupled to new large area APD compared to LSO and BGO
- Technischen Univ. Muenchen (Germany). Nuklearmedizinische Klinik und Poliklinik
- Max-Planck-Inst. fuer Physik, Muenchen (Germany)
Recent developments of large area avalanche photodiodes (APDs) and fast scintillators with high light yield offer unique advantages for imaging applications. To test possible scintillator-APD combinations, 3.7x3.7x12.0 mm{sup 3} LGSO, BGO and LSO crystals were coupled to large area, low capacitance, round and rectangular APDs (5 mm diameter, 3x3 mm{sup 2} and 5x5 mm{sup 2}, Hamamatsu, Japan). Light output, energy resolution and time resolution were compared. The light output of BGO was about 86% worse and of LGSO about 30% worse compared to LSO (100%). The energy resolution at 511 keV was 13.8{+-}0.5% for LSO and 15.1 {+-}0.5% for LGSO (FWHM). For BGO, 16.9{+-}0.5% (FWHM) was measured at 662 keV. The coincident time resolution of two opposing single detectors was 2.7{+-}0.2 ns for LSO and 3.9{+-}0.2 ns for LGSO (FWHM). Chemical treatment of crystals showed an improved energy resolution compared to mechanical polishing of more than 1%, providing reduced cost and less processing time. An energy resolution of 10.7{+-}0.5% for LSO could be reached after chemical etching. With the new large area APDs, results similar to PMT readout could be achieved. The scintillation characteristic of LGSO makes this material a promising candidate for APD readout, although the performance was inferior to LSO.
- OSTI ID:
- 679571
- Report Number(s):
- CONF-981110-; ISSN 0018-9499; TRN: 99:009503
- Journal Information:
- IEEE Transactions on Nuclear Science, Vol. 46, Issue 3Pt1; Conference: 1998 IEEE nuclear science symposium and medical imaging conference, Toronto (Canada), 10-12 Nov 1998; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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