Interventional radiology offers an alternative to open surgical procedures and helps address an array of cardiac and other medical conditions. Interventional radiology uses x-rays, ultrasound, CT scans or other imaging techniques to guide tiny tubes, wires or other very small instruments through small openings in the skin. Diagnostic cardiology exams can identify if a patient has a blocked artery in the heart and the degree of the blockage. This can help cardiologists on the medical staff make an evaluation.