학술논문
Performance analysis of phoswich/APD detectors and low noise CMOS preamplifiers for high resolution PET systems
Document Type
Conference
Source
2000 IEEE Nuclear Science Symposium. Conference Record (Cat. No.00CH37149) Nuclear science symposium Nuclear Science Symposium Conference Record, 2000 IEEE. 2:9/77-9/81 vol.2 2000
Subject
Language
ISSN
1082-3654
Abstract
An integrated, 0.8-/spl mu/ 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 (N/sub eq/) 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.