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CT front collimator and manufacturing method thereof

A technology of a front collimator and a manufacturing method, which is applied in the field of ray CT systems, can solve the problems that a detector cannot effectively filter invalid rays, a detector has a low signal-to-noise ratio, and the like

Pending Publication Date: 2021-04-30
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a CT pre-collimator and its manufacturing method to solve the problem that the existing detectors cannot effectively filter invalid rays, resulting in a low signal-to-noise ratio of the detectors

Method used

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  • CT front collimator and manufacturing method thereof
  • CT front collimator and manufacturing method thereof
  • CT front collimator and manufacturing method thereof

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Embodiment 1

[0044] In view of the above, an embodiment of the present invention, such as Figure 1 to Figure 3 As shown, a method for manufacturing a CT front collimator is disclosed, comprising the following steps:

[0045] Step 1: Determine the shape of the front collimator slit:

[0046] In the CT detection device, the rays emitted by the ray source 1 are cone beams or cone fan beams, and the apex of the cone is the focus of the ray source; the detector group 4 is a group of detectors formed by a plurality of detectors in one or more rows, such as figure 1 shown. In the current CT detection device, in order to reduce the overall size of the equipment and make the magnification ratio of the object under test consistent, the detector group 4 is usually arranged in a multi-row arc along the rotation direction and the center of the circle points to the ray source 1, and the object under test 3 is located at the center of circle.

[0047] The detector includes a crystal part and a circui...

Embodiment 2

[0054] An embodiment of the present invention, such as Figure 4 to Figure 6 As shown, a CT front collimator is disclosed, the slit of the front collimator is formed by two curves, and the shape of the curves is determined according to the manufacturing method in Embodiment 1.

[0055] In the embodiment of the present invention, the front collimator is made of heavy metal material, so that the front collimator can block redundant rays and only allow effective rays to pass through. Preferably, the front collimator is made of lead or tungsten.

[0056] In the embodiment of the present invention, within the height range of the entire front collimator (Y direction), the two long sides of the front collimator slit are formed by the two curves described in Embodiment 1 on each XZ plane, also That is to say, the shape of the slit of the front collimator is consistent with the shape of the effective rays, so that the rays entering the front collimator can completely pass through the ...

Embodiment 3

[0062] An embodiment of the present invention, such as Figure 7 to Figure 8 As shown, another CT front collimator is disclosed, the slit of the front collimator is formed by two curves, and the shape of the curves is determined according to the manufacturing method in Embodiment 1.

[0063] The front collimator of the embodiment of the present invention includes four rectangular side plates and a rectangular bottom plate. The four side plates are parallel to each other to form a box with one side open. The bottom plate is provided with a slit along the height direction, and the slit is on the XY plane. The projection is a rectangle.

[0064] When in use, the open side of the front collimator is arranged facing the radiation source 1 , and the bottom plate is arranged facing the detector group 4 . The rays enter the front collimator from the opening, pass through the gap on the bottom plate, and are received by the detector group 4 . After the rays irradiate the front collim...

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Abstract

The invention relates to a CT front collimator and a manufacturing method thereof, belongs to the technical field of ray CT systems, and solves the problem of low signal-to-noise ratio of a detector due to the fact that an existing detector cannot effectively filter invalid rays. The manufacturing method of the CT front collimator comprises the following steps: 1, determining the shape of a gap of the front collimator; and 2, processing the front collimator according to the determined shape of the gap of the front collimator. The gap of the front collimator is formed by the two curves, and the two curves are formed by projecting the detector edge lines of the two outermost rows of detectors to the plane where the gap of the front collimator is located in the ray direction, so that the front collimator reduces passing of invalid rays on the premise of ensuring the ray coverage of the detectors, scattering is reduced, and the imaging quality is improved; according to the invention, computer modeling is adopted to determine the shape of the gap of the front collimator, and the appropriate shape of the gap of the front collimator can also be determined under the condition that the detector group is in an irregular shape.

Description

technical field [0001] The invention relates to the technical field of radiation CT systems, in particular to a CT front collimator and a manufacturing method thereof. Background technique [0002] X-ray CT system is widely used in the fields of medical treatment, security inspection, non-destructive testing, etc. In the CT system, the radiation source that generates the cone-shaped radiation beam and the detector that detects the radiation rotate around the center of rotation of the object to be inspected or the object to be inspected rotates itself. There are two front and rear collimators, among which the front collimator is mainly installed at the end of the radiation source, and the range of X-rays emitted by the radiation source is restricted by the width of the slit. On the one hand, it reduces unnecessary scattering and improves the signal quality. Noise ratio, forming a better image quality; on the other hand, it can reduce unnecessary ray radiation and avoid radiat...

Claims

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Application Information

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IPC IPC(8): G01N23/046G21K1/02G06F30/17B23C3/00
CPCG01N23/046G21K1/02G06F30/17B23C3/00
Inventor 温子宽李保磊徐圆飞刘念
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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