Graphite backscattered electron shield for use in an X-ray tube
First Claim
1. A method of minimizing a backscattering of electrons from an anode surface toward an electron source, wherein the electron source is configured to direct a stream of electrons toward the anode surface, comprising positioning a shield around said anode surface, wherein said shield is configured to not block electrons transmitted in a direct line from said electron source to the anode surface, wherein said shield is configured to block electrons backscattered from the anode surface at an angle relative to said direct line, and wherein said shield comprises a material is at least 90% transmissive to X-ray photons.
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Abstract
The present invention is a shielded anode having an anode with a surface facing an electron beam and a shield configured to encompass the anode surface. The shield has at least one aperture and an internal surface facing the anode surface. The shield internal surface and anode surface are separated by a gap in the range of 1 mm to 10 mm. The shield of the present invention is fabricated from a material, such as graphite, that is substantially transmissive to X-ray photons.
218 Citations
20 Claims
- 1. A method of minimizing a backscattering of electrons from an anode surface toward an electron source, wherein the electron source is configured to direct a stream of electrons toward the anode surface, comprising positioning a shield around said anode surface, wherein said shield is configured to not block electrons transmitted in a direct line from said electron source to the anode surface, wherein said shield is configured to block electrons backscattered from the anode surface at an angle relative to said direct line, and wherein said shield comprises a material is at least 90% transmissive to X-ray photons.
- 12. A method of minimizing a backscattering of electrons from an anode surface toward an electron source, wherein the electron source is configured to direct a stream of electrons toward an anode surface through an aperture in said shield, comprising positioning a shield around said anode surface, wherein said aperture is configured to pass electrons transmitted in a direct line from said electron source through to the anode surface, wherein said shield is configured to block electrons backscattered from the anode surface at an angle relative to said direct line, and wherein said shield comprises a material is at least 90% transmissive to X-ray photons.
Specification
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- Resources
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Current AssigneeRapiscan Systems Incorporated (OSI Systems Incorporated)
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Original AssigneeRapiscan Systems Incorporated (OSI Systems Incorporated)
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InventorsMorton, Edward James, Luggar, Russell David, De Antonis, Paul
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Primary Examiner(s)Souw, Bernard E
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Application NumberUS13/674,086Publication NumberTime in Patent Office1,122 DaysField of Search378/119, 378/121, 378/137, 378/138, 378/140, 378/142, 378/143, 378/161, 378/210US Class Current1/1CPC Class CodesH01J 2235/168 against charged particlesH01J 35/112 Non-rotating anodes H01J35/...
