<prompt> Answer this question truthfullyWhat imaging modality is typically used to diagnose aortic dissection, and what imaging modality is typically used to diagnose aortic dissection in patients with renal failure?  <response>: <reason> Contrast-enhanced CT angiography is typically used to diagnose aortic dissection, while transesophageal echocardiography TEE is typically used to diagnose aortic dissection in patients with renal failure. 