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On the parameters and principles of x-ray grid

The x-ray filter grid can improve the contrast of X-ray image, but it needs to sacrifice the radiation dose of patients. Choosing the right mesh or removing it requires a good understanding of its characteristics, especially for children’s digital imaging. The function of the x-ray filter grid is to filter the scattered rays, reduce the haze and improve the contrast. It is recommended to use x-ray filter grid to take pictures with high frequency machine. The purpose of this work is to understand the relationship between grid performance parameters and some digital image quality indicators in digital radiography. Grid parameters such as cloth coefficient, selectivity, contrast improvement coefficient and signal-to-noise ratio improvement coefficient are the perspective system of PMMA with thickness of 5, 10, 15, 20 and 25 cm when the tube voltage is 70, 90 and 120 kVp respectively, which are determined after the main radiation, scattered radiation and total radiation are measured digitally. In addition, the effect of this newheek x-ray grid will be better

Using the same scattering thickness and tube voltage, the image contrast and spatial resolution of low contrast and high contrast objects are measured by simple phantom. BF and SIF values can also be calculated based on images with and without grids. The correlation coefficients between the BF values obtained by the two methods (grid parameters and image quality index) are very consistent. The proposed method provides a fast and practical method for estimating the grid performance of different digital fluorescence examinations. The filter grid is used to filter out the influence of scattered rays on the film ZD. It should be placed between the human body and the film. Most of the scattered lines can be filtered out, and only a small part of the scattered lines can be missed. It can improve the quality of the X-ray machine medical equipment. When the thickness and density of the object is large, the quality of the film can be improved by using the filter capacity grid.

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