apparatus, setup - equipment designed to serve a specific function

fluoroscope, roentgenoscope - an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation

tomograph - X-ray machine in which a computer builds a detailed image of a particular plane through an object from multiple X-ray measurements

X-ray tube - a vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of X rays