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AssigneeThe United States of America as represented by the Department of Health, Education and Welfare
InventorDavid J. Goodenough
Estimating the term…
An X-ray apparatus provides rotationally symmetric, Gaussian-like focal spot distributions. The apparatus may be constituted by an X-ray tube having a glass envelope, a cathode in the form of a filament for providing thermionically emitted electrons and an anode. The anode is of conical shape and can be rotated. The cathode is arranged to be rotated about an axis perpendicular to the plane of the filament and passing through its central point. The apparatus may be constituted by a conventional X-ray tube which is rotatable about an axis coaxial with the central ray of the X-ray field which emerges from the tube. The apparatus may be constituted by a conventional X-ray tube, which is stationary, in combination with a mechanism which effects rotation of the X-ray image receptor and the object being to be examined about an axis coaxial with the central ray of the X-ray field.
An X-ray apparatus comprising an envelope, an anode, a cathode and means for providing a rotationally symmetric, Gaussian-like focal spot distribution, wherein said cathode is a filament having a central point and being positioned in a given plane, wherein said means for providing a rotationally symmetric, Gaussian-like focal spot distribution comprises means for rotating said filament in said given plane about said central point, and wherein said means for rotating effects an integral number of revolutions of said filament during an exposure interval.
An X-ray apparatus comprising an envelope, an anode, a cathode and means for providing a rotationally symmetric, Gaussian-like focal spot distribution, wherein said cathode is a filament having a central point and being positioned in a given plane, wherein said means for providing a rotationally symmetric, Gaussian-like focal spot distribution comprises means for rotating said filament in said given plane about said central point, and wherein said filament is carried on a stem, said stem being rotatable within said envelope.
An X-ray apparatus comprising:
Dependencies are inferred from the claim text.