Computed Tomography (CT) (CAT)
Computed tomography was originally known as the “EMI scan” as it was developed at a research branch of EMI (Electro Mechanical Integrators, Inc.), a company best known today for its music and recording business. It was later known as computed axial tomography (CAT or CT scan) and body section roentgenography. Computed tomography (CT) is a medical imaging method employing tomography. Digital geometry processing is used to generate a three-dimensional image of the inside of an object from a large series of two-dimensional X-ray images taken around a single axis of rotation. CT produces a volume of data which can be manipulated, through a process known as windowing, in order to demonstrate various structures based on their ability to block the X-ray beam. Although historically the images generated were in the axial or transverse plane, modern scanners allow this volume of data to be reformatted in various planes or even as three dimensional representations of structures. Although most commonly used in health care, CT is also used in other fields, for example nondestructive materials testing.