Collimator design in SPECT, an optimisation tool

Niccoló Fuin*, Alexandre Bousse, Stefano Pedemonte, Simon Arridge, Sebastien Ourselin, Brian Hutton

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

    2 Citations (Scopus)

    Abstract

    Traditional gamma camera collimators have been based on a standard parallel design, usually with parallel holes. The collimator determines the resolution of the camera, but is also the determining factor of the number of counts detected. The uncertainty about the origin of the detected photons is modelled by a Point Spread Function (PSF), which, in literature, is normally assumed to be a Gaussian function, whose full width at half maximum (FWHM), is determined by the collimator's aperture. In this paper, these traditional assumptions will be abandoned. From related work [6] it appears possible to improve resolution recovery based reconstruction by considering different shapes of PSF. A novel collimator geometry has been then proposed, that does not imply necessarily parallel holes, but could involve a polygonal shape of the septa. To model the geometrical and septal penetration component of the point source response function a ray-tracing algorithm has been coded. In addition we developed an optimisation method that, given a target PSF, determines the optimum collimator geometry using a genetic algorithm.

    Original languageEnglish
    Title of host publicationIEEE Nuclear Science Symposuim and Medical Imaging Conference, NSS/MIC 2010
    Pages3149-3154
    Number of pages6
    DOIs
    Publication statusPublished - 2010
    Event2010 IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 2010 - Knoxville, TN, United States
    Duration: 30 Oct 20106 Nov 2010

    Other

    Other2010 IEEE Nuclear Science Symposium, Medical Imaging Conference, NSS/MIC 2010 and 17th International Workshop on Room-Temperature Semiconductor X-ray and Gamma-ray Detectors, RTSD 2010
    CountryUnited States
    CityKnoxville, TN
    Period30/10/106/11/10

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