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- W4313447174 abstract "Purpose: Neurovascular MRI suffers from a rapid drop in B1+ into the neck when using transmit head coils at 7T. One solution to improving B1+ magnitude in the major feeding arteries in the neck is to use custom RF shims on parallel transmit (pTx) head coils. However, calculating such shims requires robust multi-channel B1+ maps in both the head and the neck, which is challenging due to low RF penetration into the neck, limited dynamic range of multi-channel B1+ mapping techniques, and B0 sensitivity. We therefore sought a robust large-dynamic-range pTx field mapping protocol, and tested whether RF shimming can improve carotid artery B1+ in practice. Methods: A pipeline is presented that combines B1+ mapping data acquired using circularly polarized (CP-) and CP2-mode RF shims at multiple voltages. The pipeline was evaluated by comparing the predicted and measured B1+ for multiple random transmit shims, and by assessing the ability of RF shimming to increase the B1+ in the carotid arteries. Results: The proposed method achieved good agreement between predicted and measured B1+ in both the head and the neck. The B1+ magnitude in the carotid arteries can be increased by 42% using tailored RF shims or by 37% using universal RF shims, while also improving the RF homogeneity compared to CP mode. Conclusion: B1+ in the neck can be increased using RF shims calculated from multi-channel B1+ maps in both the head and the neck. This can be achieved using universal phase-only RF shims, facilitating easy implementation in existing sequences." @default.
- W4313447174 created "2023-01-06" @default.
- W4313447174 creator A5007772046 @default.
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- W4313447174 date "2022-12-30" @default.
- W4313447174 modified "2023-10-18" @default.
- W4313447174 title "Head-and-neck multi-channel B1+ mapping and carotid arteries RF shimming using a parallel transmit head coil" @default.
- W4313447174 doi "https://doi.org/10.48550/arxiv.2212.14596" @default.
- W4313447174 hasPublicationYear "2022" @default.
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