%0 Journal Article
%A Fiedler, Thomas
%A Ladd, Mark E
%A Orzada, Stephan
%T Local and whole-body SAR in UHF body imaging: Implications for SAR matrix compression.
%J Magnetic resonance in medicine
%V 93
%N 2
%@ 1522-2594
%C New York, NY [u.a.]
%I Wiley-Liss
%M DKFZ-2024-01898
%P 842-849
%D 2025
%Z #EA:E020#LA:E020# / 2025 Feb;93(2):842-849
%X Transmit arrays for body imaging have characteristics of both volume and local transmit coils. This study evaluates two specific absorption rate (SAR) aspects, local and whole-body SAR, of arrays for body imaging at 7 T and also for a 3 T birdcage.Simulations were performed for six antenna arrays at 7 T and one 3 T birdcage. Local SAR matrices and the whole-body SAR matrix were computed and evaluated with random shims. A set of reduced local SAR matrices was determined by removing all matrices dominated by the whole-body SAR matrix.The results indicate that all RF transmit coils for body imaging in this study are constrained by the local SAR limit. The ratio between local and whole-body SAR is nevertheless smaller for arrays with large FOV, as these arrays also expose a larger part of the human body. By using the whole-body SAR matrix, the number of local SAR matrices can be reduced (e.g., 33.3
%K UHF body imaging (Other)
%K VOPs (Other)
%K local SAR (Other)
%K whole‐body SAR (Other)
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:39301784
%R 10.1002/mrm.30306
%U https://inrepo02.dkfz.de/record/293575