Thick targets for transmission x-ray tubes

一种标靶、x射线的技术，应用在X射线管靶材料、X射线管、X射线管的零部件等方向，能够解决x射线有限制等问题

Active Publication Date: 2013-05-22
NANORAY BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Such filters correspondingly reduce low energy x-rays more than higher energy useful x-rays, however, in terms of the available focal spot size and the amount of energy that can be removed from the point on the target that the beam hits There is a limit to the amount of x-rays that can be filtered out before causing damage to the target

Method used

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  • Thick targets for transmission x-ray tubes
  • Thick targets for transmission x-ray tubes
  • Thick targets for transmission x-ray tubes

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Embodiment Construction

[0031]Open transmission tubes are commonly used in imaging of electronic circuits and other high resolution applications, and can be used as x-ray sources either when images of objects require a high multiplication factor. Closed tubes seal the vacuum, while open or "pumped" tubes are usually constantly attached to a vacuum pump for evacuation during use, so that tubes prone to failure in operation can be replaced frequently part. For the purposes of the present invention, transmissive tubes include open and closed transmissive tubes, unless otherwise specified.

[0032] Spectral data for x-ray tubes were acquired using an Amptek model XR-100 with a 1 mm thick CdTe sensor and a 10 mil Be filter unless otherwise indicated. The sensor was placed 1 meter from the x-ray tube and a tungsten collimator with a 100 μm diameter collimator hole was placed in front of the sensor. Various tube currents and exposure times were used, but comparative data have been normalized to a tube cur...

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Abstract

This invention relates to the use of thick target materials 50 microns and thicker for an x-ray transmission tube; to possible target material compositions including various elements and their alloys, eutectic alloys, compounds, or intermetallic compounds; and applications for utilizing such thick target transmission x-ray tubes. The target comprises at lease one portion of the target with a thickness of 50 microns or greater. The target can be optionally attached to a substrate end-window essentially transparent to x-rays or be thick enough so that no such substrate is required. Applications include producing a high percentage of monochromatic line mission x-rays of said thick target for use in reduced dose medical imaging and other non-destructive testing applications.

Description

technical field [0001] The present invention relates to an improved method of generating x-rays from a transmission x-ray tube which substantially reduces undesirable low energy x-rays while correspondingly enhancing higher energy characteristic line emissions from a target. In particular it relates to the use of thick transmission targets greater than about 50 microns. The present invention encompasses various applications of the invention in various medical and dental imaging, fluoroscopy, and non-destructive testing applications. Background technique [0002] US Patent 7,180,981 dated February 20, 2007, which is incorporated herein by reference in its entirety, discloses an end window x-ray tube with a target foil up to 41 microns thick. The 41 micron target material can filter out some of the x-rays generated in the lower energy range, depending on the target material used. However, the generation of low energy x-rays is still substantial, causing patients to experienc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J35/08
CPCH01J2235/081H01J2235/087H01J35/08H01J35/18H01J35/116H01J35/186
Inventor 王家琦布鲁斯·布莱恩·帕森斯
Owner NANORAY BIOTECH CO LTD
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