Moving X-ray mask with spiral window
AssigneeJohn K. Grady
InventorRemo J. Rossi
Life of this patent
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Abstract
An X-ray system includes an X-ray source directing X-radiation on a first path through a subject to an X-radiation receptor which responds to X-rays to direct light radiation on a secondary path to a light image plane. In either path or both paths is a rotating radiation-opaque mask having one or more spiral radio-transparent windows which sweep through the path as the mask rotates. Each spiral window may be formed by the overlap of coaxial spiral windows in superimposed masks which are relatively adjustable in phase to vary the window width.
Claims19
An X-ray system for radiological examination of a subject comprising:
- an X-ray source directing radiation on a first path through a subject position;
- an X-radiation receptor on the path beyond the subject responsive to received X-rays to direct light radiation on a secondary path to a light image plane;
- and
- a rotating radiation-opaque mask in one of said paths including a spiral radio-transparent window sweeping through the path as the mask rotates.
In an X-ray system directing X-radiation on a path through a subject position to an X-ray receptor emitting secondary, light radiation a scatter reducing device comprising:
- two closely superimposed, coaxial radio-opaque disks, respective disks having coaxial spiral, radio transparent windows, disposed to overlap one another to define a smaller effective window;
- and
- means rotatively supporting the disks.
Dependencies are inferred from the claim text.