The investigators will prospectively analyze OS-CMR data from patients with a generalized anxiety disorder from one site. The investigators will observe how an anxiety disorder affects the OS-CMR data. In a follow-up MRI scan, the investigators will look at the OS-CMR of a subgroup who have anxiety disorder and are also undertaking cognitive behavioural therapy to asses how and if this therapy affects the OS-CMR data.
This study aims to view variations in MRI measurements of the heart and the brain in people with anxiety versus healthy volunteers. The MRI measurements used will be Oxygenation-Sensitive Cardiac MRI (OS-CMR), a recent type of MRI which is safe, fast, and non-invasive.