TY  - JOUR
AU  - Joris Hubmann, Max
AU  - Orzada, Stephan
AU  - Kowal, Robert
AU  - Anton Grimm, Johannes
AU  - Speck, Oliver
AU  - Maune, Holger
TI  - Towards Large Diameter Transmit Coils for 7-T Head Imaging: A Detailed Comparison of a Set of Transmit Element Design Concepts.
JO  - NMR in biomedicine
VL  - 38
IS  - 5
SN  - 0952-3480
CY  - New York, NY
PB  - Wiley
M1  - DKFZ-2025-00720
SP  - e70030
PY  - 2025
AB  - Many different transmit (Tx) coil concepts and designs for 7-T magnetic resonance imaging of the head have been proposed. Most of them are placed close to the head and in combination with the receive coils creating a helmet-like structure. This limits the space for additional equipment for external stimuli. A large diameter transmit coil can increase the ease using supplementary measurement devices. Therefore, this study systematically evaluated nine different Tx elements regarding their performance within a large diameter transmit coil with a diameter > 
AB  - <br clear="all" /><table border="0" width="100%"><tr><td>
AB  - <table align="center" cellspacing="0"  cellpadding="2"><tr><td nowrap="nowrap" align="center">
AB  -   >  </td></tr></table>
AB  - </td></tr></table>
AB  - 
AB  -  350 mm. Each Tx element was examined regarding its power and specific absorption rate (SAR) efficiencies, its loading dependence, intrinsic decoupling, and its radio frequency (RF) shimming capability. Additionally, an experimental validation of  -  B 1 +  -  
AB  - <br clear="all" /><table border="0" width="100%"><tr><td>
AB  - <table align="center" cellspacing="0"  cellpadding="2"><tr><td nowrap="nowrap" align="center">
AB  -   | B<sub>1</sub><sup>+</sup> | </td></tr></table>
AB  - </td></tr></table>
AB  - 
AB  -  -maps was performed. The loop-based Tx elements (circular and rectangular loop) provided the highest power and SAR efficiency with at least 15.5
KW  - Magnetic Resonance Imaging: instrumentation
KW  - Head: diagnostic imaging
KW  - Equipment Design
KW  - Humans
KW  - Phantoms, Imaging
KW  - Brain: diagnostic imaging
KW  - 7 T MRI (Other)
KW  - EM simulations (Other)
KW  - RF coils (Other)
KW  - RF shimming (Other)
KW  - UHF (Other)
KW  - antennas (Other)
KW  - hardware (Other)
KW  - head imaging (Other)
LB  - PUB:(DE-HGF)16
C6  - pmid:40186518
C2  - pmc:PMC11971727
DO  - DOI:10.1002/nbm.70030
UR  - https://inrepo02.dkfz.de/record/300267
ER  -