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• W2034383388 abstract "Clinical single photon emission computed tomography (SPECT) equipped with pinhole collimators have a magnification factor that results in high spatial resolution images for small animal imaging. Using Monte Carlo simulations to model the acquisition process and the propagation of the photons from their point of emission to their detection point then integrating the model into an iterative reconstruction algorithm improves the signal-to-noise ratio, the contrast and the spatial resolution in the reconstructed images. However, pinhole SPECT systems are known to be very sensitive to geometrical misalignments. Geometrical misalignments are defined as the radial or axial shift of the collimator pinhole and/or twist and tilt of the detector heads and are introduced in the system each time the collimation device is changed (pinhole to parallel holes or vice versa). In this work, we present a flexible detector response function table (DRFT) design that takes into account the geometrical misalignments and avoids performing new Monte Carlo simulations for each exam in order to calculate a geometrical study-dependent system matrix. The utilization of the DRFT for the calculation of the system matrix speeds up its computation time by two orders of magnitude making it acceptable for preclinical and clinical applications." @default.
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• W2034383388 date "2013-03-15" @default.
• W2034383388 modified "2023-09-28" @default.
• W2034383388 title "A detector response function design in pinhole SPECT including geometrical calibration" @default.
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• W2034383388 doi "https://doi.org/10.1088/0031-9155/58/7/2395" @default.
• W2034383388 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4017081" @default.
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