Method of manufacturing, and a collimator mandrel having variable attenuation characteristics for a CT system
First Claim
Patent Images
1. A method of manufacturing a collimator mandrel for a CT imaging system, the method comprising the steps of:
- forming a core of base material, wherein the core includes a cylindrical rod; and
applying a tapered layer of x-ray attenuating material to the core, wherein the step of applying includes;
placing a cast circumferentially around the core, wherein the cast has an inner surface creating varying degrees of thickness circumferentially around the core; and
placing the cast circumferentially around the core such that a void of varying thickness is created between an outer surface of the core and an inner surface of the cast and filling the void with the attenuating material and allowing the attenuating material to cure and then removing the cast.
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Accused Products
Abstract
A method of manufacturing a collimator mandrel having variable attenuation characteristics is presented. The manufacturing process includes the placement of a layer of attenuating material on a core of base material. The layer of attenuating material is relatively thin and varies in thickness circumferentially around the core. The collimator mandrel may be manufactured by placing a cast about a core of non-attenuating material, filling a void between the cast and the core with an attenuating material, allowing the material to cure, and removing the cast from the assembly.
72 Citations
18 Claims
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1. A method of manufacturing a collimator mandrel for a CT imaging system, the method comprising the steps of:
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forming a core of base material, wherein the core includes a cylindrical rod; and applying a tapered layer of x-ray attenuating material to the core, wherein the step of applying includes; placing a cast circumferentially around the core, wherein the cast has an inner surface creating varying degrees of thickness circumferentially around the core; and placing the cast circumferentially around the core such that a void of varying thickness is created between an outer surface of the core and an inner surface of the cast and filling the void with the attenuating material and allowing the attenuating material to cure and then removing the cast. - View Dependent Claims (2, 3, 4, 5)
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6. A CT collimator mandrel comprising a solid cylindrical rod positioned within a layer of attenuating material, the mandrel formed by:
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shaping a bulk of supporting material into a core; positioning the core in a cast such that a non-uniform void is created between an outer surface of the core and an inner surface of the cast; placing attenuating material into the void; and removing the cast upon curing of the attenuating material. - View Dependent Claims (7, 8, 9)
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10. A process of constructing a mandrel for a CT imaging system, the process comprising the steps of:
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forming a solid cylindrical rod of a first material; depositing a layer of a second material designed to substantially block x-rays on the cylindrical rod; and affixing a pivot stud to each end of the cylindrical rod to support connection of the rod to an eccentrics assembly. - View Dependent Claims (11, 12, 13)
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14. A method of manufacturing a collimator mandrel for a CT imaging system, the method comprising the steps of:
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forming a core of base material; and applying a tapered layer of attenuating material to the core, wherein the step of applying includes; placing a cast circumferentially around the core, wherein the cast has an inner surface creating varying degrees of thickness circumferentially around the core; placing the cast circumferentially around the core such that a void of varying thickness is created between an outer surface of the core and an inner surface of the cast; filling the void with the attenuating material; and allowing the attenuating material to cure and then removing the cast. - View Dependent Claims (15, 16, 17, 18)
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Specification