Home > Publications database > 4D respiratory motion-compensated image reconstruction of free-breathing radial MR data with very high undersampling. > print

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024 7 _ |a 10.1002/mrm.26206
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100 1 _ |a Rank, Christopher
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245 _ _ |a 4D respiratory motion-compensated image reconstruction of free-breathing radial MR data with very high undersampling.
260 _ _ |a New York, NY [u.a.]
|c 2017
|b Wiley-Liss
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520 _ _ |a To develop four-dimensional (4D) respiratory time-resolved MRI based on free-breathing acquisition of radial MR data with very high undersampling.We propose the 4D joint motion-compensated high-dimensional total variation (4D joint MoCo-HDTV) algorithm, which alternates between motion-compensated image reconstruction and artifact-robust motion estimation at multiple resolution levels. The algorithm is applied to radial MR data of the thorax and upper abdomen of 12 free-breathing subjects with acquisition times between 37 and 41 s and undersampling factors of 16.8. Resulting images are compared with compressed sensing-based 4D motion-adaptive spatio-temporal regularization (MASTeR) and 4D high-dimensional total variation (HDTV) reconstructions.For all subjects, 4D joint MoCo-HDTV achieves higher similarity in terms of normalized mutual information and cross-correlation than 4D MASTeR and 4D HDTV when compared with reference 4D gated gridding reconstructions with 8.4 ± 1.1 times longer acquisition times. In a qualitative assessment of artifact level and image sharpness by two radiologists, 4D joint MoCo-HDTV reveals higher scores (P < 0.05) than 4D HDTV and 4D MASTeR at the same undersampling factor and the reference 4D gated gridding reconstructions, respectively.4D joint MoCo-HDTV enables time-resolved image reconstruction of free-breathing radial MR data with undersampling factors of 16.8 while achieving low-streak artifact levels and high image sharpness. Magn Reson Med 77:1170-1183, 2017. © 2016 International Society for Magnetic Resonance in Medicine.
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700 1 _ |a Heußer, Thorsten
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700 1 _ |a Buzan, Maria T A
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700 1 _ |a Wetscherek, Andreas
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700 1 _ |a Freitag, Martin
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700 1 _ |a Dinkel, Julien
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700 1 _ |a Kachelrieß, Marc
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773 _ _ |a 10.1002/mrm.26206
|g Vol. 77, no. 3, p. 1170 - 1183
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|t Magnetic resonance in medicine
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|y 2017
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