You will be lying on the MRI examination table during the scanning. At the end of the first part of the study, the contrast will be infused slowly through vein over about 30 minutes in the recovery area. You will then be observed for 30 minutes to 2 hours, depending on your tolerance to the contrast agent. The images taken during the first part will be then be repeated 24-36 hours later. You will receive a follow-up telephone call from a member of the study staff on Day 3.