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Scale template used for pyramidal tract x-rays CT system

An X-ray, calibration technology, applied in the field of medical imaging technology or non-destructive testing, can solve the problems of multivariate falling into local optimal solution, mechanical error and so on

Inactive Publication Date: 2005-11-09
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a calibration template for a cone beam CT system, which overcomes the need to assume certain parameters in the existing cone beam X-ray CT system calibration method, and solves multivariate variables that will fall into a local optimal solution , collecting projection data from multiple angles will introduce new mechanical errors and other deficiencies

Method used

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  • Scale template used for pyramidal tract x-rays CT system
  • Scale template used for pyramidal tract x-rays CT system
  • Scale template used for pyramidal tract x-rays CT system

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Embodiment Construction

[0136] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0137] The first step is to adjust the rotary platform to the level with a level, and then collect the projection data of the calibration template at a certain rotation angle position. There are two ways to make the calibration template, one is to inlay four point-shaped metal balls on the plexiglass plate, and the four metal balls are respectively located on the four vertices of the square; the other is to drill four points on the metal plate. The four holes are located on the four vertices of the square. The inventor needs to accurately measure the side length of the square on the calibration template (that is, the hole distance). According to the magnification of the ideal imaging relationship, the side length of the projection square of the template on the ideal detector without any misadjustment can be easily ...

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Abstract

A calibrating template for the conic-beam X-ray CT system is prepared through inlaying 4 point-shaped metallic balls in the 4 apex points of a quadrate on an organic glass or drilling 4 orifices at said 4 apex points on a metallic plate. The projection data of said calibrating template is acquired under a projecting angle and then used in conjuction with the central coordinates of the projected light spot and the side length of said quadrate to correctly calculate 6 offset parameters of said CT system of calibrating its imaging unit.

Description

technical field [0001] The invention belongs to the technical field of medical imaging technology or non-destructive testing, and relates to the production of a calibration template for improving the reconstruction accuracy of cone-beam X-ray CT and a corresponding calibration method. Background technique [0002] The ideal imaging relationship of the cone beam X-ray CT imaging system requires that the line connecting the ray source and the center of the detector should be perpendicular to the detector plane and perpendicular to the rotation axis of the rotary table. However, the actual cone-beam X-ray CT imaging system is difficult to fully satisfy the ideal imaging relationship, and the misadjustment of the system will introduce serious artifacts in the reconstructed image and reduce the reconstruction accuracy. Therefore, before using the cone beam X-ray CT system for detection, the system's misalignment parameters must be obtained to accurately calibrate the X-ray CT ima...

Claims

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Application Information

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IPC IPC(8): A61B6/03A61B6/08
Inventor 孙怡侯颖赵凤勇
Owner DALIAN UNIV OF TECH
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