One of the disadvantages of ASL-MRI is a low signal to noise ratio, this can be addressed by using high-field MRI at 3 Tesla (3T). In addition, 3T MRI can provide very good spatial resolution. The University of Nottingham represents one of the leading international research centres with experience in using high and ultra-high field MRI for investigating different neurological diseases such as multiple sclerosis and brain tumours with excellent results. Applying advanced non-invasive MRI techniques in this study will be a significant advantage as we investigate RCVS, understand the pathophysiology, and assess brain perfusion in multiple time points.