Interventional Radiological Procedures Interventional Radiology is a subspecialty of radiology in which minimally invasive procedures are performed using image guidance. Some of these procedures are done for purely diagnostic purposes, while others are done for treatment purposes. Images are used to direct these procedures, which are usually done with needles, catheters, or other tiny instruments. The images provide road maps that allow the Interventional Radiologist to guide these instruments through the body to the areas containing pain or diseases. Some examples are insertions of life saving stents, catheters to deliver drugs and removing unwanted fluid from different parts of the body. Learn more about the tests.