 Using 20cc of non-ionic contrast, an angiogram of the distal aorta and the ilio-femoral region will be performed and recorded on disc 5mins. Thereafter, an approved guidewire and intravascular ultrasound catheter will be positioned in the same arteries via the same access route, and ultrasound images of the arterial segment will be recorded 10mins.. The guidewire and the ultrasound coil will then be removed. Finally, an intravascular MRI wire will be advanced through the same arterial access andor the previously indicated venous access under X-ray control and positioned in the desired atherosclerotic segment in the region of the distal aorta or at the ilio-femoral area. The MRI wires will be secured in place by Tegaderm and the femoral sheaths will be sutured in stable position. The patient will then be transported to the MRI scanner, positioned in the scanner and images recorded over a period not exceeding 60 minutes. During the transport and throughout the MRI scanning, the patient will be monitored via an MRI-compatible cardiac monitor. During the time that the intravascular MRI coil is within the femoral sheath, it will be continuously perfused with heparinized saline and the patient will receive weight- adjusted 12 Ukg intravenous heparin for systemic anticoagulation to prevent thrombosis. To obtain the MRI images, the patients will receive gadolinium contrast as per routine radiology protocols 0.1-0.2 mmolkg. After recording the MRI images, the MRI coils and the femoral sheaths will be removed from the artery andor the vein as per usual care. 