Test and Treatment Topics The following tests and treatment topics are the most frequently researched by site visitors. Within each topic introduction, you will find links to related articles concerning specific body areas, procedure descriptions and health conditions. Computed Tomography (CT or CAT) Magnetic Resonance (MR or MRI) Ultrasound (Sonography) X-ray (Radiography) Biopsies Mammography (Breast Imaging) Nuclear Medicine Radiation Therapy (Oncology) Looking for another topic? Please search our complete Index A-Z × News and Updates List Sign-up here if you wish to receive e-mail messages containing links to new/updated RadiologyInfo.org content such as new procedures, articles about new developments, safety information and more. To sign-up for the e-mail list please fill-in the following form: Name: I am a: Patient Patient's friend or family member Student Doctor Other medical professional None of these E-mail: Area code: Phone no: If you prefer to receive news and updates via RSS feed, click here.