%0 Journal Article
%A Platt, Tanja
%A Umathum, Reiner
%A Fiedler, Thomas
%A Nagel, Armin
%A Bitz, Andreas
%A Maier, Florian
%A Bachert, Peter
%A Ladd, Mark
%A Wielpütz, Mark O
%A Kauczor, Hans-Ulrich
%A Behl, Nicolas
%T In vivo self-gated 23 Na MRI at 7 T using an oval-shaped body resonator.
%J Magnetic resonance in medicine
%V 80
%N 3
%@ 0740-3194
%C New York, NY [u.a.]
%I Wiley-Liss
%M DKFZ-2018-00702
%P 1005 - 1019
%D 2018
%X This work faces three challenges of sodium (23 Na) torso MRI on the way to quantitative 23 Na MRI: Development of a 23 Na radiofrequency transmit and receive coil covering a large part of the human body in width and length for 23 Na MRI at 7 T; reduction of blurring due to respiration in free-breathing 23 Na MRI using a self-gating approach; and reduction of image noise using a compressed-sensing reconstruction.An oval-shaped birdcage resonator with a large field of view of (400 mm)3 and a homogeneous transmit and receive field distribution was designed, simulated, and implemented on a 7T MR system. In free-breathing 3-dimensional radial 23 Na MRI (acquisition time ≈ 30 minutes), retrospective respiratory self-gating was applied, which sorts the acquired projections into two respiratory states based on the intrinsic respiration-dependent signal changes. Furthermore, a 3-dimensional dictionary-learning compressed-sensing reconstruction was applied.The developed body coil provided homogeneous radiofrequency excitation (flip angle error of 4.9
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:29427389
%R 10.1002/mrm.27103
%U https://inrepo02.dkfz.de/record/135965