PMID: 9533142Apr 9, 1998Paper

Optimal design of planar-concave collimators for SPECT--an analytical approach

Physics in Medicine and Biology
S Kimiaei, S A Larsson

Abstract

In this paper we present an analytical tool for the design and optimization of planar-concave collimators for SPECT. We conclude that a single general planar-concave collimator that eliminates the non-isotropic blurring for all SPECT applications does not exist. On the other hand, it is possible to achieve pseudo-optimal collimators for different clinical applications by a careful choice of the design parameters. By classifying the clinical applications into two groups, for instance body and brain studies, the non-isotropic blurring for most SPECT situations may be dramatically reduced by means of planar-concave collimators. The results based on Monte Carlo simulations show that the shape of the point source response function of the reconstructed image obtained from the planar-concave collimator is more isotropic than that obtained from a conventional parallel-hole collimator. Specifically, the ratio of the FWHM of the reconstructed point response function in the radial and tangential direction is increased from 0.5 for the parallel-hole to 0.85 for the planar-concave collimator for sources 200 mm away from the centre of rotation.

References

Jan 1, 1989·Physics in Medicine and Biology·A R FormiconiA Passeri
Aug 1, 1989·Computer Methods and Programs in Biomedicine·M Ljungberg, S E Strand

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