7 September 2017 A multi-purpose readout electronics for CdTe and CZT detectors for x-ray imaging applications
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Abstract
A multi-purpose readout electronics based on the DPLMS digital filter has been developed for CdTe and CZT detectors for X-ray imaging applications. Different filter coefficients can be synthesized optimized either for high energy resolution at relatively low counting rate or for high rate photon-counting with reduced energy resolution. The effects of signal width constraints, sampling rate and length were numerical studied by Mento Carlo simulation with simple CRRC shaper input signals. The signal width constraint had minor effect and the ENC was only increased by 6.5% when the signal width was shortened down to 2 τc. The sampling rate and length depended on the characteristic time constants of both input and output signals. For simple CR-RC input signals, the minimum number of the filter coefficients was 12 with 10% increase in ENC when the output time constant was close to the input shaping time. A prototype readout electronics was developed for demonstration, using a previously designed analog front ASIC and a commercial ADC card. Two different DPLMS filters were successfully synthesized and applied for high resolution and high counting rate applications respectively. The readout electronics was also tested with a linear array CdTe detector. The energy resolutions of Am-241 59.5 keV peak were measured to be 6.41% in FWHM for the high resolution filter and to be 13.58% in FWHM for the high counting rate filter with 160 ns signal width constraint.
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X. B. Yue, Z. Deng, Y. X. Xing, Y. N. Liu, "A multi-purpose readout electronics for CdTe and CZT detectors for x-ray imaging applications", Proc. SPIE 10393, Radiation Detectors in Medicine, Industry, and National Security XVIII, 103930E (7 September 2017); doi: 10.1117/12.2273857; https://doi.org/10.1117/12.2273857
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