Radiology may be divided into two different areas, diagnostic radiology and interventional radiology. Diagnostic radiology helps health care professionals see structures inside your body. Diagnostic radiology exams include CT scan, MRI, mammography, bone scan, thyroid scan, X-rays, PET and ultrasound. Interventional radiologists are doctors that use imaging such as CT, ultrasound, MRI and fluoroscopy to help guide procedures. Interventional radiologists often are involved in treating cancers or tumors, blockages in the arteries and veins, fibroids in the uterus, back pain, liver problems, and kidney problems.