CAT scan
Some of the names used for new medical inventions are as complicated as the names of the diseases they are used to diagnose. Computerized Axial Tomography (CAT scan) converts X-ray pictures into high-resolution video images. These scans can show even small differences between normal and abnormal tissue. Nuclear Magnetic Resonance Imaging (NMRI) was invented in England and the United States in 1973. By 1981, NMRI scanners, which use radio waves to produce cross-sectional images of sort tissue, could take three- dimensional pictures of the inside of the body.