Coronary Atherosclerosis T1-Weighted Characterization (CATCH)

Inclusion: * 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 who is have not suspected of having or has been diagnosed with coronary artery disease and undergone stenting or bypass surgery Exclusion: * Contraindications to MR imaging including mechanically, magnetically, or electrically activated implants, ferromagnetic implants and ferromagnetic foreign bodies, pregnancy. * Inability to tolerate MR imaging secondary to an inability to hold breath for a short time or have claustrophobia. * Non-compliant with visit instructions, including following 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.\* * Volunteers who have had four or more prior previous gadolinium contrast scan