Signal processing system and method for medical image equipment using multi threshold voltage

• SphereDiagnostics Imaging

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Summary

Recently, there has been great interest in the study of deriving PET event information from digitally sampled event waveforms. In these sampling methods, a multi-voltage threshold (MVT) method has been employed to generate samples of an event waveform of PET with respect to the user defined threshold to extract energy and time information of a PET event. The goal of this patent was to develop MVT method based PET DAQ system using field programmable gate arrays (FPGAs) extracting PET event information using the internal clock of FPGA (~350 MHz), without ADC and TDC chips.

Remarkable

The PET detector modules were composed of 4×4 matrix of 3×3×20 mm3 LYSO, a 4×4 array GAPD. Output charge signals of PET detector modules were amplified and fed into 4 comparators to generate trigger signals. The energy of the detected gamma ray was calculated by integrating the digitized pulse and the arrival time was determined from the time stamp of each trigger signal by FPGA. The calculated data packet containing energy, time and position information was stored in list mode on the host computer. The performance of the proof-of-principle DAQ was evaluated by measuring the energy resolution and time resolution of the proposed method and the values were 15% and 2.1 ns, respectively. This study demonstrated that the proposed DAQ system consisted of only FPGA without ADC and TDC chips could provide simple and cost effective DAQ system.

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