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Correction method for nonuniformity of spatial distribution of X-ray imaging

A technology of imaging space and correction method, applied in the field of X-ray imaging, can solve problems such as uneven ray intensity, troubles in practical applications, uneven brightness and darkness of images, etc.

Active Publication Date: 2014-08-20
ZHEJIANG KANGYUAN MEDICAL DEVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inhomogeneity of these ray intensities brings troubles to practical applications
For example, the image formed by X-rays will appear uneven in brightness and darkness

Method used

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  • Correction method for nonuniformity of spatial distribution of X-ray imaging
  • Correction method for nonuniformity of spatial distribution of X-ray imaging
  • Correction method for nonuniformity of spatial distribution of X-ray imaging

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Experimental program
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Embodiment Construction

[0032] Firstly, the implementation 1 of the invention will be described in detail in combination with related principles.

[0033] In short-distance X-ray imaging, for a point light source, we know that the intensity of the irradiated point light source is inversely proportional to the square of the distance from the light source (such as figure 2 shown):

[0034] I 1 ( x , y ) = A r 2 = A ( x 2 + ...

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Abstract

The invention discloses a correction method for nonuniformity of spatial distribution of X-ray imaging. The method comprises the following steps: allowing a flat panel detector to output a uniform image at a position Z1; then allowing the flat panel detector to receive a frame of image with nonuniformly distributed intensity at a position Z2; and carrying out fitting on the frame of image with nonuniformly distributed intensity by using a quadratic polynomial function so as to obtain an image correction coefficient. Thus, a uniform image at a position Z can be obtained by moving the flat panel detector to any to-be-corrected position Z and carrying out correction by using the quadratic polynomial function and the image correction coefficient, so nonuniformity of images formed by X-ray can be corrected, thereby achieving the effect of uniform imaging.

Description

technical field [0001] The present invention relates to X-ray imaging methods. Background technique [0002] Usually our X-ray imaging method is to directly irradiate the rays generated by the X-ray source to the object to be detected, and then transmit the image generated on the surface of the detector. If quantum noise is not considered, the ideal state is that when an X-ray source is directly irradiated on a flat-panel detector far away from the ray source, the distribution of X-ray intensity on the surface of the flat panel is approximately uniform, so the flat-panel detector receives the X-ray - The image formed by the ray is the image formed by shining from a simple point source. However, in actual X-ray imaging, the ray source is placed relatively close to the flat panel detector to ensure sufficient ray intensity to penetrate the object for projection imaging. At this time, the intensity distribution of the X-ray projection on the surface of the flat panel detector...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04
Inventor 陈建峰
Owner ZHEJIANG KANGYUAN MEDICAL DEVICE