3D Multi-Contrast Atherosclerosis Characterization of the Carotid Artery

Inclusion Criteria: * Healthy Volunteers: male or female ≥ 18 years of age with a BMI\<30, with no history of cardiovascular disease * Patients: Medically stable, male or female ≥ 18 years of age diagnosed with an atherosclerotic plaque in the carotid artery who have not undergone stenting of the carotid artery to be imaged. * Ability to read and understand informed consent Exclusion Criteria: * Contraindications to MRI including mechanically, magnetically, or electrically activated implants, ferromagnetic implants and ferromagnetic foreign bodies, pregnancy. * Inability to tolerate MRI secondary to an inability to lie supine or severe claustrophobia. * Non-compliant with visit instructions, including inability to lie still, hold breath or follow procedure instructions * Severe allergy to animal dander or animal-instigated asthma * Specific to gadolinium-based contrast agents: Renal function test does not meet CSMC standard of care MRI contrast protocol requirements (GFR \<45ml/min) or previous allergic reaction to gadolinium-based contrast agents.\*