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• W2095087646 abstract "Respiratory motion artifacts in positron emission tomography (PET) imaging can alter lesion intensity profiles, and result in substantially reduced activity and contrast-to-noise ratios (CNRs). We propose a corrective algorithm, coined retrospective stacking (RS), to restore image quality without requiring additional scan time. Retrospective stacking uses b-spline deformable image registration to combine amplitude-binned PET data along the entire respiratory cycle into a single respiratory end point. We applied the method to a phantom model consisting of a small, hot vial oscillating within a warm background, as well as to 18FDG-PET images of a pancreatic and a liver patient. Comparisons were made using cross-section visualizations, activity profiles, and CNRs within the region of interest. Retrospective stacking was found to properly restore the lesion location and intensity profile in all cases. In addition, RS provided CNR improvements up to three-fold over gated images, and up to five-fold over ungated data. These phantom and patient studies demonstrate that RS can correct for lesion motion and deformation, while substantially improving tumor visibility and background noise." @default.
• W2095087646 created "2016-06-24" @default.
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• W2095087646 date "2006-06-26" @default.
• W2095087646 modified "2023-10-16" @default.
• W2095087646 title "Reducing respiratory motion artifacts in positron emission tomography through retrospective stacking" @default.
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• W2095087646 doi "https://doi.org/10.1118/1.2207367" @default.
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