Volunteer purpose: To test the UTE MRI to ensure it runs correctly before testing in patients, collect data of normal values of iron in the liver in people without iron overload using the UTE MRI and to compare the current MRI (GRE) with the UTE. The UTE MRI will give an accurate value of liver iron in patients with large iron deposits in the liver, therefore providing an accurate means to diagnose, monitor, and provide treatments for participants. This new technology will impact the care of many different populations with iron overload, such as patients with sickle cell disease and thalassemia. Estimated accrual for healthy volunteers is 35.