Changes in Renal Artery Movement Due to Respiration Before and After Fenestrated Endovascular Repair

Purpose: The purpose of this study is to evaluate the location within the renal artery of maximal angular displacement before and after fenestrated endovascular aortic repair (FEVAR) using CT with end-inspiration and end-expiration CT images before and after repair. Then, the renal artery segment with maximal angular displacement on each will be located and any changes described. Participants: There will be 30 subjects recruited from UNC Hospitals. Procedures (methods): For this study, patients will receive an additional CT sequence (end-expiration CT), which will be compared with the standard of care end-inspiration CT to calculate angular displacement and the distance from the aorta.