An anode has a base member, on which an X-ray active layer is applied. A first cooling circuit with a first cooling medium extends at least in part in the base member beneath the X-ray active layer. A second cooling circuit with a second cooling medium is arranged beneath the first cooling circuit. The anode exhibits distinctly improved thermo mechanical properties.

An X-ray tube housing is disclosed that has oil channels integrated (e.g., built into) the X-ray tube housing that accommodate a flow of oil through interior spaces of the X-ray tube housing. A first oil channel from a mid-casing portion of the X-ray tube housing to a pump housing inlet is built into the mid-casing portion, and a second oil channel from a pump housing outlet to a heat exchanger located in an anode-side casing is built into the anode-side casing. The integrated oil channels reduce a number of sealing joints, which reduces the opportunities for leaks, and allows an X-ray tube assembly to be assembled with fewer parts.

A lightweight X-ray tube assembly and X-ray CT equipment having the same. The X-ray tube assembly includes an X-ray tube and a tube housing. The X-ray tube includes: a cathode for generating an electron beam; an anode for radiating X rays by collision of the electron beam; an envelope for holding the cathode and the anode in a vacuum atmosphere; and an X-ray window provided in the envelope to irradiate some of X rays radiated from the anode toward a test subject. The tube housing encapsulates the X-ray tube together with an insulating oil. The X-ray tube assembly further includes a protective member that is provided at least around the X-ray window on an outer wall of the envelope and shields the X rays.