The authors have developed distance-dependent deconvolution of collimator blur for 3D SPECT reconstruction. The collimator model is based on the frequency-distance principle (FDP), and the authors have applied it to the circular harmonic transform (CHT) SPECT reconstruction algorithm. The filter model used is a 3D Wiener (FT stochastic) filter. Since the filter is applied between the premultiply and backprojection phases of reconstruction, it is an intrinsic filter, rather than a pre or post filter. The authors compare the new 3D filter to (i) the 3D post filter followed by attenuation correction as implemented in a commercial nuclear medical imaging system, (ii) the 3D collimator model and a standard Wiener filter formulation, and (iii) the "gold standard" or quantitative CHT SPECT protocol that utilizes a 2D Wiener prefilter. In all cases, the new 3D filter yielded the best images with minimal noise amplification.<>


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    Title :

    An intrinsic 3D Wiener filter for the deconvolution of spatially varying collimator blur


    Contributors:


    Publication date :

    1994-01-01


    Size :

    444667 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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