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• W2028309234 abstract "Positron emission tomographs (PETs) are currently almost exclusively designed as hybrid systems. The current standard is the PET/CT combination, while prototype PET/MRI systems are being studied by several research groups. One problem in these systems is that the transaxial field-of-view of the second system is smaller than that of the PET camera and does not provide complete attenuation data. Because this second system provides the image for PET attenuation and scatter correction, the smaller FOV causes truncation of the attenuation map, producing bias in the attenuation corrected activity image. In this paper, we propose a maximum-a-posteriori algorithm for estimating the missing part of the attenuation map from the PET emission data. The method is evaluated on five artificially truncated <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex Notation=TeX>$^{18}{rm F mathchar702D FDG PET/CT}$</tex></formula> studies, where it reduced the error on the reconstructed PET activities from 20% to less than 7%. The results on a PET/MRI patient study with <formula formulatype=inline xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink> <tex Notation=TeX>$^{18}{rm F mathchar702D FDG}$</tex></formula> are presented as well." @default.
• W2028309234 created "2016-06-24" @default.
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• W2028309234 date "2013-02-01" @default.
• W2028309234 modified "2023-10-14" @default.
• W2028309234 title "Completion of a Truncated Attenuation Image From the Attenuated PET Emission Data" @default.
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• W2028309234 doi "https://doi.org/10.1109/tmi.2012.2220376" @default.
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