Evaluation of optimally designed planar-concave collimators in single-photon emission tomography

Shahrok Kimiaei, Michael Ljungberg, Stig A Larsson

Research output: Contribution to journalArticlepeer-review


The imaging properties of optimally designed planar-concave (PC) collimators were evaluated by means of Monte Carlo simulations. The evaluation was done with respect to total system spatial resolution and the overall image noise distribution in single-photon emission tomography. The results showed that the non-isotropy with PC collimators, assessed by the ratio of the full-width at half-maximum in the radial and tangential directions, was reduced by about 60% as compared with a conventional parallel-hole collimator for sources located 200 mm away from the centre of rotation. Furthermore, the image noise distribution along the object radius became more uniform when the curved collimator was used. The maximum increase in noise due to use of the curved collimator was about 45% close to the edge of the phantom, where the hole length was about 3 times longer. We also showed with Monte Carlo simulations that the spatial resolution of the lateral cortex when using the curved collimator was significantly improved due to improved radial resolution.
Original languageEnglish
Pages (from-to)1398-1404
JournalEuropean Journal Of Nuclear Medicine
Issue number11
Publication statusPublished - 1997

Subject classification (UKÄ)

  • Radiology, Nuclear Medicine and Medical Imaging

Free keywords

  • Spatial resolution
  • Conventional parallel-hole collimator
  • Planar-concave collimator
  • Image noise distribution
  • Single-photon emission tomography


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