Radiographic imaging system for high energy radiation

• US 4,017,730 A
• Filed: 01/16/1976
• Issued: 04/12/1977
• Est. Priority Date: 05/01/1974
• Status: Expired due to Term

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Barrett, Harrison H.
• Primary Examiner(s): Borchelt, Archie R.
• Application Number:
  US05/649,878
• Time in Patent Office: 452 Days
• Field of Search: 250/363 S, 250/366, 250/505
• US Class Current: 250/363.06
• CPC Class Codes: G01T 1/295 using coded aperture devices, e.g. Fresnel zone plates handling of radiation of particles, e.g. using diaphragms, collimators, diffraction G21K1/00

Abstract

A radiographic imaging system for high energy radiation utilizing a detector of such radiation and a mask having regions relatively transparent to such radiation interspersed among regions relatively opaque to such radiation. A relative motion is imparted between the mask and the detector, the detector providing a time varying signal in response to the incident radiation and in response to the relative motion. The time varying signal provides, with the aid of a decoder, an image of a source of such radiation.

Claims

1. A radiographic scanning system comprising:

a camera responsive to incident radiation propagating thereto from a subject;

a mask interposed between said subject and said camera said mask having an elongated region transparent to said radiation and having a predetermined shape;

means coupled to said camera for displaying an image of said subject; and

means for moving said camera along said elongated region.

2. A system according to claim 1 wherein said elongated region has the shape of an arc, and wherein said moving means includes a pivot about which said camera is rotated, said pivot being positioned above the center of curvature of said elongated region.

3. A system according to claim 2 wherein the axis of said pivot passes through said camera.

4. A system according to claim 2 wherein said moving means translates said camera along said elongated region, said moving means rotating an axis of said camera about said pivot, said moving means including means for rotating said camera about said camera axis in a direction opposite the direction of rotation of said camera axis about said pivot to provide pure translatory motion of said camera along said elongated region.

5. A system according to claim 1 further comprising means for displacing said elongated region sideways relative to the direction of said motion of said camera.

6. A system according to claim 1 wherein said display means includes count rate means for signalling a rate of occurrence of radiation signals of said radiation incident upon said camera, means for storing count rate signals of said count rate means, and means for combining data of successive ones of said count rate signals to provide said image of said subject.