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Correction Method for Spatial Inhomogeneity of X-ray Imaging

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

Active Publication Date: 2016-03-23
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 Spatial Inhomogeneity of X-ray Imaging
  • Correction Method for Spatial Inhomogeneity of X-ray Imaging
  • Correction Method for Spatial Inhomogeneity of X-ray Imaging

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Experimental program
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Embodiment Construction

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

[0033] In close-range X-ray imaging, for point light sources, we know that the intensity of the illuminated point 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 + y 2 + z 0 2 ) = I 0 · 1 ( 1 + ( x z 0 ) 2 + ( y z 0 ) 2 ) ≈ I 0 · ( 1 - ( x x 0 ) 2 - ( y z 0 ) 2 ) ≈ I 0 · ( 1 - θ x 2 - θ y 2 ) - - - ( 1 )

[0035] Where A is the intensity of the light source, z 0 Is the shortest vertical distance between a point light source and the surface of the plate, I 0 =A / z 0 2 , R is the distance between...

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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 invention relates to an X-ray imaging method. Background technique [0002] Usually our X-ray imaging method is to directly irradiate the radiation generated by the X-ray source to the detected object, and then transmit the image on the surface of the detector. If quantum noise is not considered, the ideal state is when an X-ray source directly irradiates a flat-panel detector far away from the source, the distribution of X-ray intensity on the flat-panel surface is approximately uniform, so the flat-panel detector receives the X -The image formed by the rays is the image formed by illuminating from a simple point light source. However, in actual X-ray imaging, the ray source is placed in a relatively close range from 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 will not be uniform. T...

Claims

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Application Information

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