X-ray tubes

An X-ray tube comprising:

• a ceramic structure;
• a cathode body hermetically sealed to a first end of the ceramic structure;
• an anode body hermetically sealed to a second end of the ceramic structure;
• the anode body having a borehole intersecting with a conical X-ray window extending radially from the borehole, a target surface located within the borehole and adjacent to the conical X-ray window, the target surface formed to have an angle relative to an axis of the borehole that directs X-ray emission towards the conical X-ray window, where a portion of borehole adjacent to the target surface extends through the anode body to form a tunnel such that the target surface is recessed within the tunnel;
• wherein an outer surface of the anode body comprises a first portion for coupling to an interior of the ceramic structure and a second portion that is radially offset from the interior of the ceramic structure;
• and
• the cathode body having a filament coupled within a central cup portion and configured to emit electrons in an electron beam towards the anode upon the application of a current to the filament.