Title :
Performance analysis of phoswich/APD detectors and low noise CMOS preamplifiers for high resolution PET systems
Author :
Lecomte, R. ; Pepin, C.M. ; Lepage, M.D. ; Pratte, J.-F. ; Dautet, H. ; Binkley, D.M.
Author_Institution :
Sherbrooke Univ., Que., Canada
Abstract :
An integrated, 0.8-μ CMOS charge-sensitive preamplifier previously designed for LSO/APD based PET systems has been further investigated for use with multi-crystal/APD PET detectors. In addition to low-noise, wide-band performance and power efficiency, high dynamic range and good signal-to-noise ratio over a broad range of shaping times are required to process the signals from crystals being used in phoswich detectors, which have a wide range of scintillation decay time and light output characteristics. The preamplifier equivalent noise charge (Neq) was measured as a function of input capacitance and amplifier shaping time constant. The performance of the preamplifier was also assessed using APDs coupled to a variety of scintillators. Measurements were obtained at a preamplifier input-device current of 2 and 4 mA. The higher bias lead to marginal improvements of the timing performance but had no effect on energy resolution
Keywords :
CMOS integrated circuits; avalanche photodiodes; positron emission tomography; preamplifiers; semiconductor device models; semiconductor device noise; solid scintillation detectors; 2 mA; 4 mA; PET; avalanche photodiode; energy resolution; equivalent noise charge; low noise CMOS preamplifiers; phoswich; phoswich/APD detector; signal-to-noise; timing; Current measurement; Dynamic range; Multi-stage noise shaping; Performance analysis; Positron emission tomography; Preamplifiers; Signal processing; Signal to noise ratio; Solid scintillation detectors; Wideband;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2000 IEEE
Conference_Location :
Lyon
Print_ISBN :
0-7803-6503-8
DOI :
10.1109/NSSMIC.2000.949874
