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Automatic calibration method for reconstructing voxel sizes of cone beam 3D-CT scanning system

A 3D-CT, voxel size technology, which is applied in the direction of material analysis using radiation, can solve the problems of low precision and difficult projection geometric magnification ratio, and achieve the effect of high precision, simple implementation and reduced improvement cost

Inactive Publication Date: 2013-07-31
NAT INST OF METROLOGY CHINA
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Problems solved by technology

This calibration method avoids the difficulty and low precision of the existing calibration method to obtain the projection geometric magnification ratio, and does not need to perform CT scanning on the standard parts before calibration, and has the advantages of simple operation, high precision and high degree of automation

Method used

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  • Automatic calibration method for reconstructing voxel sizes of cone beam 3D-CT scanning system
  • Automatic calibration method for reconstructing voxel sizes of cone beam 3D-CT scanning system
  • Automatic calibration method for reconstructing voxel sizes of cone beam 3D-CT scanning system

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Embodiment

[0114] The voxel size of a certain cone beam 3D-CT scanning system is automatically calibrated by using the calibration method of the present invention. The spherical target used in the verification is a steel ball with a diameter of 19mm. The physical size of the detection unit is 0.2mm. Figure 2A , Figure 2B , Figure 2C and Figure 2D is the DR image of the steel ball at a certain imaging position and the contour map extracted after image processing, which corresponds to D i = 330mm. Table 1 shows the measurement results of different travel distances of the verification turntable. Plot D of Table 1 i -V i relationship diagram, such as image 3 As shown, it can be seen that the relationship between the travel distance of the turntable and the voxel size is a linear linear function relationship, which proves the correctness of the above inference.

[0115] Input the linear equation fitted by the data in Table 1 into the automatic calibration module of the cone beam...

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Abstract

The invention discloses an automatic calibration method for reconstructing voxel sizes of a cone beam 3D-CT scanning system. The method comprises utilizing diameter information of DR projection of spherical target bodies under different stroke distances along an X axis, using a least squares method for regression of a stroke-voxel size relationship V=b+kD under different imaging positions, and then embedding the V=b+kD in an automatic calibration module of the cone beam 3D-CT scanning system. When the cone beam 3D-CT scanning system operates, the calibration module automatically calculates exact values of the voxel sizes according to different scanning positions, thereby ensuring accuracy of data analysis and characteristic measurement based on 3D-CT images. The calibration method prevents difficulties of large difficulty in calculating a projective geometry amplification ratio and low precision existing in present calibration method, does not need to calibrate standard components after a CT scanning, and has advantages of simple operation, high precision and high automatic degree.

Description

technical field [0001] The invention relates to an automatic calibration of voxel size suitable for cone beam 3D-CT scanning system reconstruction, which can be used in medical and industrial ray digital imaging (ie DR projection), two-dimensional and three-dimensional computed tomography (2D-CT / 3D -CT) related measurements during imaging. Background technique [0002] In recent years, with the rapid development of computer technology and the emergence of area array detectors, the cone beam 3D-CT (Cone-beam Three Dimensional Computed Tomography) system has increasingly become a research hotspot in the field of NDT (Non-destructive Testing). The scanning principle of the cone beam 3D-CT scanning system is as follows: figure 1 As shown, the first adjustment frame 11 of the cone beam 3D-CT scanning system 10 is equipped with a radiation source 1, the second adjustment frame 12 is equipped with an area array detector 5, and the third adjustment frame 13 is equipped with a turnt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04
Inventor 李兴东刘文丽李德红郭彬洪宝玉王晓龙桂志国魏东波杨民
Owner NAT INST OF METROLOGY CHINA
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