Design of a fast shaping amplifier for PET/CT APD detectors with depth-of-interaction

被引：1

作者：

Pratte, JF ^{[1
]}

Pepin, CM ^{[1
]}

Rouleau, D ^{[1
]}

Ménard, O ^{[1
]}

Mouine, J ^{[1
]}

Lecomte, R ^{[1
]}

机构：

[1] Univ Sherbrooke, Dept Elect & Comp Engn, Sherbrooke, PQ J1H 5N4, Canada

来源：

2001 IEEE NUCLEAR SCIENCE SYMPOSIUM, CONFERENCE RECORDS, VOLS 1-4 | 2002年

关键词：

shaping amplifier; CMOS; PET; folded cascode transconductance amplifier; pulse shape discrimination;

D O I：

10.1109/NSSMIC.2001.1009680

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

An integrated, 0.35mum CMOS fast shaping amplifier has been designed for coincidence detection and zero-cross time pulse shape discrimination (PSD) in PET, and for high rate event counting in CT with APD-based detectors. Analytical simulations of CR-RCn filters of various order and shaping time constant were carried out to optimize the timing performance, keeping in mind the stringent channel density requirements of the detector front-end electronics. The filter was implemented with the biquadratic bandpass architecture using a folded cascode transconductance amplifier. The electronic timing resolution of the coincidence circuit was 92ps in the ideal case without an APD (Cin = 0pF), and 243ps with an APD (Cin = 30pF). By comparison, the same system with the CMOS shaper replaced by an Ortec 579 Fast Filter Amplifier set to a shaping time of 10ns yielded an electronic time resolution of 79ps in the ideal case without capacitance, and 236ps with the APD. The 511keV coincidence time resolution for an LSO/APD detector was measured to be 1.49ns.

引用

页码：807 / 811

页数：5