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Elimination of Central Artefacts of L-SPECT with Modular Partial Ring Detectors by Shifting Center of Scanning

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Document pages: 6 pages

Abstract: The Lightfield Single Photon Emission Computed Tomography (L-SPECT) system isdeveloped to overcome some of the drawbacks in conventional SPECT by applyingthe idea of plenoptic imaging. This system displayed improved performance interms of reduced information loss and scanning time when compared to the SPECTsystem which has a conventional collimator. The SPECT system is transformedinto L-SPECT system by replacing the conventional collimators with micro-rangemulti-pinhole arrays. The field of view (FOV) of the L-SPECT system is enhancedby reshaping the detector head into ring-type by tiling small detector modules.The L-SPECT system with modular partial ring detectors (MPRD L-SPECT) exhibitscylindrical artefacts during volumetric reconstruction. Hence, here the work isfocused to remove the cylindrical artefacts in the reconstruction of theexamined objects by changing the scanning orbit. The enhancement is done suchthat the center of scanning of the L-SPECT system with MPRD L-SPECT is shiftedat different values. The reconstruction quality of MPRD L-SPECT with andwithout center shifting is evaluated in terms of the Full Width at Half Maximum(FWHM) and Modulation Transfer Function (MTF). Moreover, the visual comparisonis also examined. The results indicate that center shifting of MPRD L-SPECTovercomes the problem of the central artefact with improved FWHM. By increasingMPRD s scanning center shift gap, the spatial resolution can be furtherimproved.

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