Title :
A PET detector module using FPGA-only MVT digitizers
Author :
Daoming Xi ; Chen Zeng ; Wei Liu ; Xiang Liu ; Lu Wan ; Heejong Kim ; Luyao Wang ; Chien-Min Kao ; Qingguo Xie
Author_Institution :
Dept. of Biomed. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China
fDate :
Oct. 27 2013-Nov. 2 2013
Abstract :
Multi-voltage threshold (MVT) is an amplitude-based sampling method. It takes timing samples when the event pulse crosses the user-defined thresholds. Only a few comparators and TDCs are required when implementing such digitizer. Previously, we have demonstrated an FPGA-only MVT digitizer based on this method. The FPGA-only MVT digitizer employs the differential I/Os in an FPGA as the required comparators and FPGA based TDCs. The implementation of this digitizer is entirely based on the FPGA. We have demonstrated that it is possible to implement a significant number of MVT digitizers by using a single FPGA. It is also flexible, as it allows us to readily modify, or add functions to, the implementation without requiring costly hardware changes. Currently, we are developing a PET detector module using the FPGA-only MVT digitizer. In this paper we describe the design and implementation of the detector module and report its performance properties. The detector module has a total detection sensitive area of 50mm × 50mm, an overall energy resolution of 15.1% FWHM at 511keV, and a module-level coincidence timing resolution of 684ps FWHM. In addition, our preliminary imaging with such detector module successfully resolves 1.6mm-diameter rods separated by 3.2mm.
Keywords :
analogue-digital conversion; data acquisition; field programmable gate arrays; image reconstruction; medical image processing; positron emission tomography; sampling methods; FPGA-only MVT digitizers; PET detector module; amplitude-based sampling method; module-level coincidence timing resolution; multivoltage threshold; overall energy resolution; preliminary imaging; size 1.6 mm; total detection sensitive area; user-defined thresholds; Crystals; Detectors; Energy resolution; Field programmable gate arrays; Positron emission tomography; Timing; Digitizer; FPGA; LVDS; MVT; PET; all digital data acquisition (DAQ) system; block detector;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2013 IEEE
Conference_Location :
Seoul
Print_ISBN :
978-1-4799-0533-1
DOI :
10.1109/NSSMIC.2013.6829063