Patent ID: 7382865

Claim:
A rotary piston x-ray radiator comprising: a radiator housing containing a cooling medium; a rotary piston x-ray tube rotatably mounted in said radiator housing, said rotary piston x-ray tube comprising a vacuum housing and a rotary anode and a cathode fixedly mounted in said vacuum housing and rotated together with said vacuum housing, said vacuum housing having a first end at which said cathode is mounted and a second end at which said anode is mounted, and a narrowed neck region between said first and second ends, and a first frustrum-conical region between said first end and said neck region and a second frustrum-conical region between said neck region and said second end; radiation shielding to prevent leakage x-ray radiation from exiting said radiator housing, said radiation shielding comprising a shielding region disposed at said vacuum housing and rotating therewith in said radiator housing, with said first end of said vacuum housing being free of said radiation shielding.