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Sampling pulses for optimal timing
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2007 (English)In: IEEE Transactions on Nuclear Science, ISSN 0018-9499, E-ISSN 1558-1578, Vol. 54, no 2, 320-326 p.Article in journal (Refereed) Published
Abstract [en]

When extracting unknown band-limited pulses from sampled data, the Nyquist criterion defines the minimum sampling frequency. With well-defined pulse shapes and a stationary noise environment one can use matched filters to recover time and amplitude, but this is usually not the case with scintillation detectors. If the noise is not stationary other methods must be used. Our study investigates different timing strategies and how the timing precision depends on ADC resolution and sample rate. It also compares the timing precision with data obtained from an analogue setup. Pulses from an LSO crystal with photomultiplier readout are studied experimentally. Our best method gives in this case a 10% improvement in timing compared to a matched filter approach. Some simulation results are also reported

Place, publisher, year, edition, pages
2007. Vol. 54, no 2, 320-326 p.
Keyword [en]
Nyquist criterion, analogue-digital conversion, bandlimited signals, photomultipliers, scintillation counters, signal resolution, signal sampling, synchronisation
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-24108DOI: 10.1109/TNS.2007.892692ISI: 000246171100004OAI: oai:DiVA.org:su-24108DiVA: diva2:196762
Note
Part of urn:nbn:se:su:diva-6618Available from: 2007-02-08 Created: 2007-02-01 Last updated: 2017-12-13Bibliographically approved
In thesis
1. FPGA based data acquistion and digital pulse processing for PET and SPECT
Open this publication in new window or tab >>FPGA based data acquistion and digital pulse processing for PET and SPECT
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The most important aspects of nuclear medicine imaging systems such as Positron Emission Tomography (PET) or Single Photon Emission Computed Tomography (SPECT) are the spatial resolution and the sensitivity (detector efficiency in combination with the geometric efficiency). Considerable efforts have been spent during the last two decades in improving the resolution and the efficiency by developing new detectors. Our proposed improvement technique is focused on the readout and electronics. Instead of using traditional pulse height analysis techniques we propose using free running digital sampling by replacing the analog readout and acquisition electronics with fully digital programmable systems.

This thesis describes a fully digital data acquisition system for KS/SU SPECT, new algorithms for high resolution timing for PET, and modular FPGA based decentralized data acquisition system with optimal timing and energy. The necessary signal processing algorithms for energy assessment and high resolution timing are developed and evaluated. The implementation of the algorithms in field programmable gate arrays (FPGAs) and digital signal processors (DSP) is also covered. Finally, modular decentralized digital data acquisition systems based on FPGAs and Ethernet are described.

Place, publisher, year, edition, pages
Stockholm: Fysikum, 2007. 76 p.
Keyword
Digital signal processing, positron emission tomography, single photon computed tomography, field programmable gate arrays, digital signal processors, digital data acquisition, free running clock sampling
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-6618 (URN)91-7155-382-7 (ISBN)
Public defence
2007-03-02, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Supervisors
Available from: 2007-02-08 Created: 2007-02-01Bibliographically approved

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