TY - GEN
T1 - Design of an 81-Channel Read-out System for a Hybrid PMT/SIPM Modular Gamma-ray Camera
AU - Ruiz-Gonzalez, Maria
AU - Richards, R. Garrett
AU - Doty, Kimberly J.
AU - Kuo, Phillip H.
AU - King, Michael A.
AU - Furenlid, Lars R.
N1 - Funding Information:
Manuscript received December 20, 2020. This work was partially supported by NIH/NIBIB grants P41EB002035 and R01EB022521. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH. The authors disclose that P. H. Kuo has a financial interest and partial employment in Invicro, a Konica Minolta company. Corresponding author: Maria Ruiz-Gonzalez (mariaruiz@arizona.edu).
Publisher Copyright:
© 2020 IEEE
PY - 2020
Y1 - 2020
N2 - AdaptiSPECT-C is a dedicated human brain SPECT system currently under development. The system utilizes hybrid PMT/SiPM modular gamma-ray scintillation cameras with 81 photosensor channels for each camera. Here we present the read-out system design for the modular cameras. A front-end board inside the camera enclosure performs the current-to-voltage conversion for the photosensor signals. The back-end board receives the 81 analog signals and estimates time of interaction and amount of light acquired by each photosensor. The energy estimation is performed by sigma-delta modulation (SDM). A non-uniform 2-bit SDM is utilized for triggering and timing. The SDM approach utilized in the front-end board reduces the complexity of the system compared to conventional ADC methods, while maintaining system performance. The digital side of the SDMs is implemented on the FPGA of a system-on-chip, which also contains an ARM-based processor. A direct memory access (DMA) controller implemented on the FPGA writes the data to on-board memory. An embedded lightweight TCP/IP stack reads the data from memory and streams it to the system computer. The back-end board also monitors and controls camera temperature, and supplies power to the camera.
AB - AdaptiSPECT-C is a dedicated human brain SPECT system currently under development. The system utilizes hybrid PMT/SiPM modular gamma-ray scintillation cameras with 81 photosensor channels for each camera. Here we present the read-out system design for the modular cameras. A front-end board inside the camera enclosure performs the current-to-voltage conversion for the photosensor signals. The back-end board receives the 81 analog signals and estimates time of interaction and amount of light acquired by each photosensor. The energy estimation is performed by sigma-delta modulation (SDM). A non-uniform 2-bit SDM is utilized for triggering and timing. The SDM approach utilized in the front-end board reduces the complexity of the system compared to conventional ADC methods, while maintaining system performance. The digital side of the SDMs is implemented on the FPGA of a system-on-chip, which also contains an ARM-based processor. A direct memory access (DMA) controller implemented on the FPGA writes the data to on-board memory. An embedded lightweight TCP/IP stack reads the data from memory and streams it to the system computer. The back-end board also monitors and controls camera temperature, and supplies power to the camera.
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U2 - 10.1109/NSS/MIC42677.2020.9507965
DO - 10.1109/NSS/MIC42677.2020.9507965
M3 - Conference contribution
AN - SCOPUS:85124691261
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 -