TY - GEN
T1 - Comparison of Conventional and SDM-based Read-out Systems for Gamma-ray Imaging
AU - Ruiz-Gonzalez, Maria
AU - Furenlid, Lars R.
N1 - Publisher Copyright:
© 2020 IEEE
PY - 2020
Y1 - 2020
N2 - One relatively inexpensive way a gamma-ray imaging system can be upgraded is by updating the read-out electronics system and, as a consequence, modernizing the digitization and data-processing methods. The objective of this project is to replace the front-end electronics of modular gamma-ray cameras utilized in multiple small-animal PET and SPECT systems developed at the University of Arizona within the last 20 years. We have previously presented the new front-end board, which utilizes 1-bit sigma-delta modulation (SDM) for energy estimation and a non-uniform 2-bit SDM architecture for timing estimation and triggering. One advantage of this digitization method is that instead of ADC integrated circuits, only a few analog components per channel are utilized, which reduces the complexity and power consumption of the system. The board also includes, among other resources, a Xilinx FPGA combined with an ARM-based processor, DDR3 SDRAM and QSPI flash memory. This project presents the comparison between the original and the new SDM-based front-end electronics board, implemented in a 9-channel modular gamma-ray camera, by obtaining the spectrum of each individual photomultiplier tube (PMT) with both front-end boards. The results show an improvement of 1.5x to 2x in the PMT spectrum resolution with the new approach.
AB - One relatively inexpensive way a gamma-ray imaging system can be upgraded is by updating the read-out electronics system and, as a consequence, modernizing the digitization and data-processing methods. The objective of this project is to replace the front-end electronics of modular gamma-ray cameras utilized in multiple small-animal PET and SPECT systems developed at the University of Arizona within the last 20 years. We have previously presented the new front-end board, which utilizes 1-bit sigma-delta modulation (SDM) for energy estimation and a non-uniform 2-bit SDM architecture for timing estimation and triggering. One advantage of this digitization method is that instead of ADC integrated circuits, only a few analog components per channel are utilized, which reduces the complexity and power consumption of the system. The board also includes, among other resources, a Xilinx FPGA combined with an ARM-based processor, DDR3 SDRAM and QSPI flash memory. This project presents the comparison between the original and the new SDM-based front-end electronics board, implemented in a 9-channel modular gamma-ray camera, by obtaining the spectrum of each individual photomultiplier tube (PMT) with both front-end boards. The results show an improvement of 1.5x to 2x in the PMT spectrum resolution with the new approach.
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U2 - 10.1109/NSS/MIC42677.2020.9507744
DO - 10.1109/NSS/MIC42677.2020.9507744
M3 - Conference contribution
AN - SCOPUS:85124692766
T3 - 2020 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2020
BT - 2020 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2020
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2020 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2020
Y2 - 31 October 2020 through 7 November 2020
ER -