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Grouping method for collimation sheets of X-ray industrial CT equipment

A grouping method and collimating sheet technology, which are applied in the field of X-ray linear array detectors, can solve the problems of image error, detector position deviation from the actual position, and the position of the collimation hole is not considered, and achieve the effect of good image quality.

Active Publication Date: 2015-04-29
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rear collimator is generally assembled with multiple groups of collimating sheets. Since the thickness of each collimating sheet and the processing accuracy of the groove depth are different, there are many factors to be considered when grouping the collimating sheets. For example, each group of collimating sheets The thickness of the collimation sheet, the depth of the groove, the position and size of the collimation holes formed by the combination of adjacent collimation sheets, the thickness of each group of collimation sheets, etc., the previous grouping method only considered the thickness of the collimation sheet, and did not consider the collimation hole position and other factors , so there is a certain deviation between the detector position and the actual position in the theoretical calculation, which will lead to a certain error in the image

Method used

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  • Grouping method for collimation sheets of X-ray industrial CT equipment
  • Grouping method for collimation sheets of X-ray industrial CT equipment
  • Grouping method for collimation sheets of X-ray industrial CT equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] figure 1 It is a schematic diagram of the structure of the linear array detector, A is the focus position of the ray source, B is the layer thickness adjustment device, C is the collimator array, D0 is the central detector, Di and Dj are the edge detectors, and the detectors take AD0 as the axis axisymmetric structure. figure 2 It is a schematic diagram of the structure of the collimator. The collimator is composed of two collimating sheets of different specifications, such as figure 2As shown, the shape of the collimating sheet is double-sided and single-grooved. The two collimators have the same parameters except for the width, the length is L0, the design thickness of the thick end is d1, the design thickness of the thin end is d2, and the design thickness of the midpoint is d0 (d0=(d1+d2) / 2 ), the groove depth design value is h0, and each design value is related to equipment parameters such as X-ray energy.

[0051] Figure 6 It is a flow chart of the method f...

Embodiment 2

[0086] The difference between this embodiment and Embodiment 1 is that this embodiment takes a as an even number as an example to illustrate the specific process of the collimation sheet grouping method for X-ray industrial CT equipment:

[0087] First measure the thickness of each collimating sheet. Select 12 points on each collimating sheet, such as image 3 As shown, 1-6 is located on the left side of the collimating sheet, 7-12 is located on the right side of the collimating sheet, and the distances from points 1, 2, 5, 6, 7, 8, 11, and 12 to both ends of the collimating sheet are L, Points 3, 4, 9, and 10 are located at the midpoint of the collimating sheet. Use a thickness gauge to measure the thickness of each point, the thickness of the thick end is (d1-Δd1, d1+Δd2), the thickness of the thin end is (d2-Δd1, d2+Δd2), and the thickness of the midpoint is (d0-Δd1, d0 +Δd2) range is considered qualified, where Δd1 and Δd2 are the upper and lower tolerances of the thickn...

Embodiment 3

[0101] The difference between this embodiment and embodiment 2 is that: this embodiment takes a as an odd number as an example to illustrate the specific process of the collimation film grouping method for X-ray industrial CT equipment:

[0102] When a is an odd number, the collimation sheet in front of the detector D0 is a large sheet, except that the first group selects a large sheet for grouping, and the grouping method is the same as when a is an even number.

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Abstract

The invention discloses a grouping method for collimation sheets of X-ray industrial CT equipment. The grouping method comprises a step of measuring a thickness D and groove depths of each of the collimation sheets, wherein the groove depths refers to a left-groove depth HL and a right-groove depth HR; a step of selecting N collimation sheets that are qualified both in thickness and in groove depth, and determining the number of groups and the number of sheets in each group; a step of setting a first group of the collimation sheets by using a central detector D0 as the symmetry point of the axisymmetric structure; and a step of successively setting a second group and a third group of the collimation sheets from the center symmetric point to both sides respectively, ensuring that the collimation sheets in adjacent groups are collimation sheets of opposite types, until all the collimation sheets are selected. According to the grouping method, back collimation sheets of a linear array detector are grouped by a manner of comprehensively considering thicknesses and groove depths of the collimation sheets, and therefore center location and aperture width, of a collimating hole formed by each group of the collimation sheets, have minimum errors with theoretical design values. The collimator formed by the grouping method provided by the invention is closer to the theoretical design values than collimators that are formed by grouping only according to thicknesses of collimation sheets, thereby achieving better image quality.

Description

technical field [0001] The invention relates to the field of X-ray linear array detectors, in particular to a method for grouping collimated slices of X-ray industrial CT equipment. Background technique [0002] In X-ray industrial CT equipment, common detectors can be divided into two types: linear array and area array. In order to suppress scattered rays and improve the spatial resolution of the system, a collimator is generally used in front of the line array detector to obtain better image quality. There are two types of collimators: front collimator and rear collimator, usually made of heavy metal materials such as lead or tungsten. The rear collimator is used to limit the ray beam entering the detector, which determines the window size of each detection unit in the detector, and is one of the main factors determining the spatial resolution of the system. The rear collimator is generally assembled with multiple groups of collimating sheets. Since the thickness of each...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B07C5/04
Inventor 段晓礁鲁诗忠
Owner CHONGQING UNIV