Arterial spin labeling (ASL) is a primary approach for non-invasive perfusion measurements with MRI. Theoretically, performing ASL at ultrahigh magnetic field strength can be beneficial because of the increased SNR as well as the lengthened T1-relaxation time. However, ASL is still not widely used at 7T due to the obstacles of B1+ inhomogeneity and high SAR associated with labeling. To overcome this problem, we apply array compressed parallel transmission (acpTx) in ASL and find that the optimized coil achieved 2x better B1+ homogeneity, and 4x lower SAR than a conventional 8-channel coil, which could enable 7T ASL with neck labeling.
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