This study will compare the results of a clinically ordered abdominal CT angiography to a research non-contrast MR angiogram (MRA). CTA is a "gold-standard" for identifying blockages in the kidney arteries or other blood vessel problems. CTA requires radiation and contrast to obtain useful images. Conversely, the MR abdomen technique being used for the study uses no radiation or contrast and is felt to be a safer option for individuals who have kidney problems. there is benefit to establishing non-contrast MRA as a clinically accurate test.
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Inclusion Criteria: * The abdominal CTA evaluation form has been completed and confirmed to fit criteria for study enrollment * The research MRA will be completed within 3 months of abdominal CTA * Subject signed and dated the informed consent form * Subject agrees to a "research" abdominal MRA * Subject is able to follow breathing and scanning instructions * Subject is at least 18 years of age Exclusion Criteria: * Subject has had a significant change in clinical condition between the time of abdominal CTA and abdominal MRA (e.g. worsening renal function, renal vascular intervention) * Subject has renal stents, or other known material that may affect MR image quality * Subject has a contraindication to an MRI * Subject had intravenous gadolinium media within the previous 24 hours * Subject has a baseline heart rate \>90 beats per minute or respiratory rate \>25 breaths/minute