Data acquisition electronics for gamma ray emission tomography using width-modulated leading-edge discriminators

Physics in Medicine and Biology
E LageJ J Vaquero

Abstract

We present a new high-performance and low-cost approach for implementing radiation detection acquisition systems. The basic elements used are charge-integrating ADCs and a set of components encapsulated in an HDL (hardware definition language) library which makes it possible to implement several acquisition tasks such as time pickoff and coincidence detection using a new and simple trigger technique that we name WMLET (width-modulated leading-edge timing). As proof of concept, a 32-channel hybrid PET/SPECT acquisition system based on these elements was developed and tested. This demonstrator consists of a master module responsible for the generation and distribution of trigger signals, 2 x 16-channel ADC cards (12-bit resolution) for data digitization and a 32-bit digital I/O PCI card for handling data transmission to a personal computer. System characteristics such as linearity, maximum transmission rates or timing resolution in coincidence mode were evaluated with test and real detector signals. Imaging capabilities of the prototype were also evaluated using different detector configurations. The performance tests showed that this implementation is able to handle data rates in excess of 600k events s(-1) when acquiring simult...Continue Reading

References

Feb 18, 2005·Physics in Medicine and Biology·Martin S JudenhoferSimon R Cherry
Feb 13, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Thomas H EppsErin L Jablonski
Jun 18, 2009·Physics in Medicine and Biology·Yibao WuRamsey D Badawi
Aug 25, 2009·Physics in Medicine and Biology·E LageM Desco
May 21, 2010·IEEE Transactions on Nuclear Science·Hongdi LiWai-Hoi Wong

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