Implementing ASL at ultra-high field is challenging due to increased specific absorption rate (SAR), along with B1+ and B0 inhomogeneity. Parallel transmission (pTx) provides additional degrees of freedom to mitigate B1+ inhomogeneity. Among various pTx strategies, RF shimming is a simple formulation that modulates the complex weights of each RF channel. In this study, we explored the possibility of using VERSE to further improve PCASL at 7T, and VERSE-guided RF shimming was shown to achieve improved SNR in perfusion-weighted images over power-matched Circularly-Polarised (CP) mode and RF-shimmed Gaussian labelling schemes.
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