%0 Journal Article
%A Aigner, Christoph Stefan
%A Dietrich, Sebastian
%A Schmitter, Sebastian
%T Respiration induced B 1 + changes and their impact on universal and tailored 3D kT-point parallel transmission pulses for 7T cardiac imaging.
%J Magnetic resonance in medicine
%V 87
%N 6
%@ 0740-3194
%C New York, NY [u.a.]
%I Wiley-Liss
%M DKFZ-2022-00268
%P 2862-2871
%D 2022
%Z #LA:E020# / 2022 Jun;87(6):2862-2871
%X Human heart imaging at ultra-high fields is highly challenging because of respiratory motion-induced artefacts and spatially heterogeneous B 1 + profiles. This work demonstrates that respiration resolved 3D B 1 + -maps can be used with a dedicated tailored and universal parallel transmission (pTx) pulse design to compensate respiration related B 1 + changes in subjects performing shallow and deep breathing (SB/DB).Three-dimensional (3D) B 1 + -maps of the thorax were acquired in 31 subjects under SB and in 15 subjects under SB and DB. Different universal and tailored non-selective pTx pulses were designed from non-respiration resolved (NRR) and respiration resolved (RR) reconstructions of the SB/DB B 1 + -maps. The performance of all pulses was tested with RR-SB/DB B 1 + -maps. Respiration-robust tailored and universal pulses were applied in vivo in 5 subjects at 7T in 3D gradient-echo free-breathing scans.All optimized pTx pulses performed well for SB. For DB, however, only the universal and the tailored respiration-robust pulses achieved homogeneous flip angles (FAs) in all subjects and across all respiration states, whereas the tailored respiration-specific pulses resulted in a higher FA variation. The respiration-robust universal pulse resulted in an average coefficient of variation in the FA maps of 12.6
%K 7 Tesla (Other)
%K body MRI (Other)
%K heart (Other)
%K parallel transmission (Other)
%K respiration robust (Other)
%K universal pulse (Other)
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:35142400
%R 10.1002/mrm.29183
%U https://inrepo02.dkfz.de/record/178789