A method for measuring focal point size

A technology of focus size and measurement method, applied in the field of measurement, can solve problems such as long time consumption and complicated operation, and achieve the effect of easy test conditions, simple operation, and simple operation and test conditions.

Active Publication Date: 2019-01-29
LANZHOU UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a focus size measurement method, which aims to solve the problems of complicated operation and long time consumption in the existing focus size measurement method

Method used

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  • A method for measuring focal point size
  • A method for measuring focal point size
  • A method for measuring focal point size

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] The application principle of the present invention will be further described below in conjunction with the accompanying drawings.

[0033] Such as figure 1 Shown: a focal point size measurement method, the focal point size measurement method is:

[0034] S101: Utilize the cone-beam lead hole on the X-ray tube, and use a flat-panel detector to capture the light field of rays exiting the cone-beam lead hole;

[0035] S102: Calculate the focus size by using the geometric unsharpness of the edge of the light field.

[0036] The application effects of the present invention will be further described below in combination...

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Abstract

The invention discloses a focus size measuring method which comprises the following steps: cone beam lead holes of an X ray tube are used, a flat panel detector is used for collecting light field images that are formed after X rays pass through the cone beam lead holes, edge ray intensity distribution can be obtained, and a focus size can be obtained via calculation. According to the focus size measuring method, only lead cone holes of the ray tube are needed, the flat panel detector is used for collecting the light field images, the edge ray intensity distribution of a light field can be obtained, and the focus size can be obtained via calculation. Only simple operation and testing conditions are needed, and experiment results show that the method can be used for rapid and convenient measurement of the focus size.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a method for measuring a focal point size. Background technique [0002] X-ray tubes are widely used in radiography systems in the fields of medicine, material science, and industrial non-destructive testing. The focal point size is an important parameter of the X-ray tube, which significantly affects the image quality of the X-ray imaging system. The focal point size of the X-ray tube is one of the main factors determining the limit spatial resolution of the X-ray imaging system. In addition, with the use of X-ray tubes, the surface of the anode target will become rough and cause diffuse reflection of rays, while the cathode filament will change its shape due to aging. Changes to assess the degree of aging of the X-ray tube. To sum up, the focus size is the decisive factor of the spatial resolution of the X-ray imaging system, and can be used as an important ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/29H05G1/26
CPCG01T1/29H05G1/26
Inventor 潘小东张催李公平
Owner LANZHOU UNIVERSITY
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