Measuring Method of Detector Angle Deviation in Cone Beam CT System Based on Feature Texture Template

Abstract

The invention provides a measurement method of angle deviation of a cone beam CT system detector, based on a feature texture template, and belongs to the technical field of computed tomography in thefield of image processing. The method is characterized in that a specific template comprising rotational symmetry texture and translational symmetry texture is adopted to establish relationship between the angle deviation of the detector and two types of texture images, so that the angle deviation of the detector is solved. The method has the effects and benefits that a calibration template with feature textures is adopted to collect single-angle projection data to obtain the angle deviation of the cone beam CT system detector, the template is easy to manufacture, the method is simple to operate, and the problems that the template is difficult to manufacture and measurement operation is complex are solved.

Description

technical field

[0001] The invention belongs to the technical field of computer tomography (CT) in the field of image processing, and relates to a method for measuring the angle deviation of a detector of a cone-beam CT system by using a calibration template with a characteristic texture. Background technique

[0002] The geometric angle deviation correction of computer tomography (Computed Tomography, CT) system is one of the basic problems to be solved in the field of CT research. Industrial X-ray CT system, as a testing device, can perform non-destructive testing on the dimensions, defects and features inside the object to be tested. In an industrial CT system, the ray source is an X-ray source, and the emitted light is a cone beam. The cone beam CT system requires that the detector has no angular deviation under the ideal imaging relationship. However, during the installation process of the industrial CT system, the detector will inevitably produce angular deviation, a...

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