Crossover Comparison of Two Gadolinium Contrast Agents for Use With MRA of Carotid, Renal and Peripheral Arteries

Inclusion Criteria: * 18 yrs of age or older * referred for enhanced MRA of carotid, renal/abdominal or peripheral arteries * Able to provide written informed consent and comply with protocol requirements * Highly suspected of or with known disease of the carotid, renal/abdominal or peripheral vasculature using specific criteria listed in the protocol Exclusion Criteria: * pregnant or lactating females * Known allergy to one or more of the ingredients in the products under investigation * Significant congestive heart failure ( Class IV) * Moderate to severe chronic kidney disease * Therapeutic intervention of any kind for vascular disease in the territory of interest between the two contrast procedures * Vascular stents in vessels of interest * Received another contrast agent in the 24 hrs preceding or proceeding each exam * Previously entered into the study * Contraindications to MRI * Severe Claustrophobia Undergone DSA between the two exams