MR‐based PET attenuation correction using a combined ultrashort echo time/multi‐echo Dixon acquisition
نویسندگان
چکیده
منابع مشابه
MRI-based attenuation correction for hybrid PET/MRI systems: a 4-class tissue segmentation technique using a combined ultrashort-echo-time/Dixon MRI sequence.
UNLABELLED Accurate γ-photon attenuation correction (AC) is essential for quantitative PET/MRI as there is no simple relation between MR image intensity and attenuation coefficients. Attenuation maps (μ-maps) can be derived by segmenting MR images and assigning attenuation coefficients to the compartments. Ultrashort-echo-time (UTE) sequences have been used to separate cortical bone and air, an...
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UNLABELLED One of the challenges in PET/MRI is the derivation of an attenuation map to correct the PET image for attenuation. Different methods have been suggested for deriving the attenuation map from an MR image. Because the low signal intensity of cortical bone on images acquired with conventional MRI sequences makes it difficult to detect this tissue type, these methods rely on some sort of...
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UNLABELLED Integrated PET/MR systems are becoming increasingly popular in clinical and research applications. Quantitative PET reconstruction requires correction for γ-photon attenuations using an attenuation coefficient map (μ map) that is a measure of the electron density. One challenge of PET/MR, in contrast to PET/CT, lies in the accurate computation of μ maps. Unlike CT, MR imaging measure...
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J. Franke, H. Donker, F. Mottaghy, C. Kuhl, F. Kiessling, and V. Schulz Molecular Imaging Systems, Philips Research Europe, Aachen, North Rhine-Westphalia, Germany, Experimental Molecular Imaging, University of Aachen (RWTH), Aachen, North Rhine-Westphalia, Germany, Diagnostic and Interventional Radiology, University Hospital Aachen, Aachen, North Rhine-Westphalia, Germany, Nuclear Medicine, Un...
متن کاملAnatomic evaluation of 3-dimensional ultrashort-echo-time bone maps for PET/MR attenuation correction.
UNLABELLED Ultrashort-echo-time (UTE) sequences have been proposed in the past for MR-based attenuation correction of PET data, because of their ability to image cortical bone. In the present work we assessed the limitations of dual-echo UTE imaging for bone segmentation in head and neck imaging. Sequentially acquired MR and PET/CT clinical data were used for this purpose. METHODS Twenty pati...
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ژورنال
عنوان ژورنال: Medical Physics
سال: 2020
ISSN: 0094-2405,2473-4209
DOI: 10.1002/mp.14180