%0 Journal Article
%A Rank, Christopher
%A Heußer, Thorsten
%A Buzan, Maria T A
%A Wetscherek, Andreas
%A Freitag, Martin
%A Dinkel, Julien
%A Kachelrieß, Marc
%T 4D respiratory motion-compensated image reconstruction of free-breathing radial MR data with very high undersampling.
%J Magnetic resonance in medicine
%V 77
%N 3
%@ 0740-3194
%C New York, NY [u.a.]
%I Wiley-Liss
%M DKFZ-2017-00411
%P 1170 - 1183
%D 2017
%Z E025
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:26991911
%R 10.1002/mrm.26206
%U https://inrepo02.dkfz.de/record/119784