Timing Improvement by Low-Pass Filtering and Linear Interpolation for the LabPET Scanner

• Published in: IEEE transactions on nuclear science Vol. 55; no. 1; pp. 34 - 39
• Main Authors: Fontaine, R., Lemieux, F., Viscogliosi, N., Tetrault, M.-A., Bergeron, M., Riendeau, J., Berard, P., Cadorette, J., Lecomte, R.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-02-2008; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Digital signal processing; Energy consumption; filtered interpolation; Filtering; Frequency; Interpolation; Low pass filters; Nonlinear filters; position emission tomography (PET); Positron emission tomography; Power consumption; Radiation detectors; Sampling; Sampling methods; Scanners; Thresholds; Time measurements; timestamp generation; Timing
• DOI: 10.1109/TNS.2007.911883
• EISSN: 1558-1578
• ISSN: 0018-9499

Digital processing for positron emission tomography (PET) scanners commonly relies on low frequency sampling (MHz) to reduce power consumption. Timestamps must then be interpolated between samples to achieve adequate time resolution for coincidence detection of annihilation radiation. A low-pass filter based interpolation algorithm adding up to 31 samples between original samples was designed to improve timing resolution of the LabPET scanner. A 2-bit refinement in the determination of the pulse maximum amplitude leads to a better estimation of the triggering threshold, which in turn enables a more accurate timestamp generation. Timestamp accuracy was investigated as a function of trigger level (15%-50% of maximum value). With the trigger threshold set at 20%, coincidence time resolution of ns for LYSO-LYSO and ns for LGSO-LGSO are obtained. A real time implementation of the algorithm was achieved in a Xilinx FPGA.