TY  - JOUR
AU  - Platt, Tanja
AU  - Umathum, Reiner
AU  - Fiedler, Thomas
AU  - Nagel, Armin
AU  - Bitz, Andreas
AU  - Maier, Florian
AU  - Bachert, Peter
AU  - Ladd, Mark
AU  - Wielpütz, Mark O
AU  - Kauczor, Hans-Ulrich
AU  - Behl, Nicolas
TI  - In vivo self-gated 23 Na MRI at 7 T using an oval-shaped body resonator.
JO  - Magnetic resonance in medicine
VL  - 80
IS  - 3
SN  - 0740-3194
CY  - New York, NY [u.a.]
PB  - Wiley-Liss
M1  - DKFZ-2018-00702
SP  - 1005 - 1019
PY  - 2018
AB  - 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
LB  - PUB:(DE-HGF)16
C6  - pmid:29427389
DO  - DOI:10.1002/mrm.27103
UR  - https://inrepo02.dkfz.de/record/135965
ER  -