A cylindrical SPECT camera with de-centralized readout scheme

F. Habte, P. Stenström, A. Rillbert, A. Bousselham, C. Bohm, S. A. Larsson

Research output: Contribution to journalArticle

3 Citations (Scopus)


An optimized brain single photon emission computed tomograph (SPECT) camera is being designed at Stockholm University and Karolinska Hospital. The design goal is to achieve high sensitivity, high-count rate and high spatial resolution. The sensitivity is achieved by using a cylindrical crystal, which gives a closed geometry with large solid angles. A de-centralized readout scheme where only a local environment around the light excitation is readout supports high-count rates. The high resolution is achieved by using an optimized crystal configuration. A 12mm crystal plus 12mm light guide combination gave an intrinsic spatial resolution better than 3.5mm (140keV) in a prototype system. Simulations show that a modified configuration can improve this value. A cylindrical configuration with a rotating collimator significantly simplifies the mechanical design of the gantry. The data acquisition and control system uses early digitization and subsequent digital signal processing to extract timing and amplitude information, and monitors the position of the collimator. The readout system consists of 12 or more modules each based on programmable logic and a digital signal processor. The modules send data to a PC file server-reconstruction engine via a Firewire (IEEE-1394) network.

Original languageEnglish
Pages (from-to)80-84
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
Publication statusPublished - 1 Dec 2001
Externally publishedYes



  • Cylindrical detectors
  • De-centralized readout
  • Early digitization
  • Fire wire
  • Optimal pulse processing

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

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