This trial will evaluate a non-invasive brain imaging technique QUTE-CE MRI using Ferumoxytol as a contrast agent, and validate the method with first-in-human studies. Subjects who are already scheduled to receive ferumoxytol infusion will undergo MRI scans after the infusion. The ferumoxytol infusion itself is not a part of the study. The project will provide brain angiograms and establish a human cerebrovascular atlas that will enable future quantitative diagnosis of cerebrovascular abnormalities by revealing abnormal regions of the brain that characterize disease, a tool which doesn't currently exist, and which could lead to many exciting discoveries and clinical applications in neurology.