The partial volume effect in PET/SPECT and Benford's Law

Kevin Wells, John Chiverton, Mike Partridge, Miriam Barry, Haval Kadhem, Bob Ott

    Research output: Chapter in Book/Report/Conference proceedingConference contribution


    In this work we consider a probabilistic methodology that models the intensity distributions found in pure and partial volume (PV) voxels. We introduce some methodological developments that enable explicit modeling of the PV voxels prior probability density function (PDF). This new formulation can be applied generically across different imaging modalities including PET and SPECT. In this paper, we establish for the first time, that the prior PDF of voxels that arise from the PV effect in volumetric data can be well described by a simple phenomenological law called Benford's Law, which significantly eases parameter estimation compared to other methods. Results from simulated data are presented, along with a preliminary PET phantom study utilizing registered CT data to determine the quality of the resulting probabilistic voxel classification scheme.
    Original languageEnglish
    Title of host publicationIEEE 2005 Nuclear Science Symposium and Medical Imaging Conference Record
    Place of PublicationPiscataway
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    ISBN (Print)0780392213
    Publication statusPublished - 2005


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