Title :
Data acquisition system design for a 1 mm3 resolution PSAPD-based PET system
Author :
Olcott, Peter D. ; Lau, Frances W.Y. ; Levin, Craig S.
Author_Institution :
Stanford Univ., Stanford
fDate :
Oct. 26 2007-Nov. 3 2007
Abstract :
We are developing an application specific, high resolution 1 mm3 3-D PET system that comprises two detector panels that are 16 cm times 9.1 cm times 2 cm in dimension with arrays of sandwiched position sensitive avalanche photodiode (PSAPD) detectors. The system will comprise 2240 PSAPD devices per panel with approximately 11,200 channels per detector head. A data acquisition architecture is being designed around dedicated readout ASICs. The readout ASIC, the RENA-3, was developed by NOVA R&D for low noise charge sensitive readout of solid state detectors, with shaping, triggering, and timestamp generation circuitry. Using the RENA-3 evaluation system, two PSAPD devices operated in coincidence achieved a 17.2% global energy resolution, 1 mm2 spatial resolution, and 11 ns (15.5 ns paired) FWHM coincidence time resolution. A Monte-Carlo simulation of a PET mammography configuration was used to generate realistic count rates. The realistic count rates were then run through an event based simulation model of the PET mammography system and data acquisition to determine the count rate performance of the architecture. The data acquisition we propose with the RENA-3 ASIC readout should be able to handle a 5 mCi imaged whole body dose in a 160 cm tall woman receding 75% of the events with a 100 keV low energy threshold.
Keywords :
Monte Carlo methods; avalanche photodiodes; biomedical equipment; data acquisition; dosimetry; image resolution; mammography; position sensitive particle detectors; positron emission tomography; readout electronics; Monte-Carlo simulation; PET mammography; PET system; RENA-3 ASIC readout; charge sensitive readout; coincidence technique; data acquisition; detector panels; dosimetry; electron volt energy 100 keV; event based simulation model; position sensitive avalanche photodiodes; size 16 cm; size 160 cm; size 2 cm; size 9.1 cm; spatial resolution; Application specific integrated circuits; Avalanche photodiodes; Data acquisition; Energy resolution; Head; Mammography; Position sensitive particle detectors; Positron emission tomography; Sensor arrays; Spatial resolution;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2007. NSS '07. IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-0922-8
Electronic_ISBN :
1095-7863
DOI :
10.1109/NSSMIC.2007.4436823