Inclusion Criteria:  • At least 18 years of age  Able to complete the MR safety questionnaire. Able to comprehend and provide informed consent in English. When contrast is being administered: healthy volunteers with a GFR≥60 ml/min When contrast is being administered: patients with a GFR ≥30 ml/min  Exclusion Criteria:  • When contrast is being administered: subjects with a GFR < 30 ml/min  When contrast is being administered: subjects with acute kidney injury When contrast is administered, allergy to gadolinium-containing contrast media Contraindication to MRI (implanted device, claustrophobia, dyspnea precluding the ability to follow breath-hold instructions) Adults unable to consent Individuals who are not yet adults Pregnant or breastfeeding women Prisoners