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Industrial CT three-dimensional image reconstruction method based on data rearrangement and conjugate rays

A 3D image and data rearrangement technology, applied in image data processing, 3D modeling, material analysis using wave/particle radiation, etc., to achieve the effect of simplifying the calculation process, strong robustness, and improving accuracy

Pending Publication Date: 2022-07-29
CHINA JILIANG UNIV
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Problems solved by technology

[0005] The present invention proposes an industrial CT three-dimensional image reconstruction method based on data rearrangement and conjugate rays for the deficiencies of existing industrial CT reconstruction algorithms

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  • Industrial CT three-dimensional image reconstruction method based on data rearrangement and conjugate rays
  • Industrial CT three-dimensional image reconstruction method based on data rearrangement and conjugate rays
  • Industrial CT three-dimensional image reconstruction method based on data rearrangement and conjugate rays

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Embodiment Construction

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] like figure 1 As shown, the steps of the inventive method are:

[0027] Step 1: Use the circular orbit scanning mode to detect the workpiece on the cone beam X-ray of the industrial CT, and obtain the projection data of the plane detector under different scanning angles;

[0028] like figure 2 As shown, the X-ray source emits cone-beam X-rays to penetrate the inspected workpiece, and the flat-panel detector senses the attenuation of the X-ray intensity to obtain a projection data map. After that, the turntable rotates clockwise, and for every 1° rotation, the flat panel detector can collect one projection data map. During the measurement process, the turntable rotates for one turn, and the flat-panel detector can obtain a total of 360 projection data maps, and the cone beam X-rays form a circular scanning orbit relative to the turntable. At the same time, wit...

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Abstract

The invention discloses an industrial CT three-dimensional image reconstruction method based on data rearrangement and conjugate rays. The method comprises the following steps: firstly, obtaining projection data of a tested sample through industrial cone beam CT circular orbit scanning; then, rearranging the projection data through a method of converting a plane detector into a cylindrical surface detector, and improving the precision of the projection data by adopting four adjacent point bilinear interpolation; then, cosine weighting is carried out on the rearranged projection data, a three-dimensional empirical weighting function is constructed by adopting a method based on conjugate rays, and secondary weighting is carried out; and then, a one-dimensional slope filter is adopted to filter weighted projection data, and a reconstruction result is obtained through back projection. The method has high robustness, and reconstruction artifacts of large cone angle projection data can be eliminated, so that the accuracy of industrial CT measurement is improved.

Description

technical field [0001] The invention relates to an industrial CT three-dimensional image reconstruction method based on data rearrangement and conjugate rays, in particular to an industrial cone beam CT circular orbit three-dimensional image approximate reconstruction method. Background technique [0002] Industrial CT is an industrial application of computed tomography technology. It uses high-energy X-rays to penetrate the detected workpiece to obtain projection data, and then obtains a two-dimensional image or three-dimensional image of the workpiece through a reconstruction algorithm. Industrial CT can clearly, accurately and intuitively display the size, position, shape and composition, material and defect status of the internal structure of the detected workpiece without contact and damage. influences. Industrial CT has the advantages of fast detection speed and high spatial and density resolution. Therefore, industrial CT is widely used in the field of industrial non...

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Application Information

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IPC IPC(8): G06T17/00G01N23/046
CPCG06T17/00G01N23/046
Inventor 陶镛泽胡佳成施玉书皮磊蔡晋辉
Owner CHINA JILIANG UNIV
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