Uniformization correction method for X-ray hardened artifact and based on spiral die bodies

Abstract

The invention relates to two die bodies withe the same inventive concept and discloses a hardening calibration method for an X-ray CT beam and based on the die bodies. One X-ray CT beam hardening calibration die body comprises an upper part and a lower part, the upper part is a measurement structure, the main body of the upper part is a cylinder, the outer edge of the bottom face of the cylinder is an Archimedean spiral, step-shaped circular holes are formed in the outer edge of the bottom face of the cylinder, the diameter of the adjacent layers of the circular holes is equal to or slightly larger than the difference of the maximum radius and the minimum radius of the spiral, and an outer spiral parameter and an inner layer number are corrected according to the actual measurement demands;the lower part is an auxiliary structure which is divided into a holding area, a centering area and a clamping area from top to bottom, and the surface of the holding area is rough, convenience is provided for operation; the centering area is a smooth cylinder used for conducting centering operation on a detector; in the operation process, the radius of the corresponding inner layer is selected according to the required penetration distance, firstly, the centering area in the auxiliary structure is placed in the center of a view field for centering, then the die bodies are downwards moved, the steps of the inner layer, corresponding to the selected radius, in the measurement structure are placed in the center of the view field for 360-degree scanning.

Description

technical field [0001] The invention relates to a method and phantom for multi-energy X-ray CT beam hardening calibration Background technique [0002] Computed Tomography (abbreviated as CT), which mainly uses multi-angle X-ray scanning and computer reconstruction algorithms to obtain the three-dimensional structure of the measured object, plays an important role in industrial non-destructive testing. Its imaging principle uses Lambert-Beer's law, that is, when a single-energy X-ray penetrates a single homogeneous object, the negative logarithm of the ratio of the outgoing light intensity to the incident light intensity is proportional to the penetration distance of the ray in the object, thus CT detection can obtain the internal structure and composition information of substances. [0003] At present, the reconstruction algorithm used in the CT field is based on single-energy ray imaging in principle, but the X-rays used in actual detection are multi-energy rays, so the r...

AI Technical Summary

Problems solved by technology

One disadvantage of this method is that it needs to move the sample for multiple measurements, which is not only time-consuming, but also easily introduces errors during the displacement process.

Another disadvantage is that the calibration results are poorly adaptable to different ray source voltages, and need to be re-measured when the voltage changes

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