TY  - JOUR
AU  - Fiedler, Thomas
AU  - Ladd, Mark E
AU  - Orzada, Stephan
TI  - Local and whole-body SAR in UHF body imaging: Implications for SAR matrix compression.
JO  - Magnetic resonance in medicine
VL  - 93
IS  - 2
SN  - 1522-2594
CY  - New York, NY [u.a.]
PB  - Wiley-Liss
M1  - DKFZ-2024-01898
SP  - 842-849
PY  - 2025
N1  - #EA:E020#LA:E020# / 2025 Feb;93(2):842-849
AB  - 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
KW  - UHF body imaging (Other)
KW  - VOPs (Other)
KW  - local SAR (Other)
KW  - whole‐body SAR (Other)
LB  - PUB:(DE-HGF)16
C6  - pmid:39301784
DO  - DOI:10.1002/mrm.30306
UR  - https://inrepo02.dkfz.de/record/293575
ER  -