Lateral ear point correction method based on three-in-one CBCT skull lateral image

Abstract

The invention provides a lateral ear point correction method based on a three-in-one CBCT skull lateral image. The method comprises the following steps that two skull lateral images are obtained through a three-in-one CBCT, after the three-in-one CBCT shoots the first skull lateral image, the three-in-one CBCT rotates according to a set rotation angle to shoot the second skull lateral image, and the two skull lateral images contain projections of lateral ear points; a side ear point correction formula is established according to the two skull side images; position parameters of the side ear points in the two skull side images are obtained through a threshold segmentation method; and a correction angle of the side ear point is obtained according to the set rotation angle, the position parameter and a side ear point correction formula. According to the invention, the number of skull side images needing to be acquired can be reduced, so that the damage to the three-in-one CBCT ray sourcecan be reduced, the calculation data can be reduced, the calculation time can be saved, and the correction accuracy is relatively high.

Description

Technical field [0001] The invention relates to the technical field of ear point correction, in particular to a method for lateral ear point correction based on a three-in-one CBCT lateral image of the head. Background technique [0002] At present, before the three-in-one CBCT machine leaves the factory, the three-in-one CBCT machine needs to be corrected laterally. The correction of the three-in-one CBCT machine's lateral position is mainly to correct the overlap of its ear points. [0003] However, when correcting its ear point overlap, it is often affected by many factors, such as the spatial position of the light source focal point, the distance between the two ear points, the distance from the focal point to the ear point, and the distance from the ear point to the detector plane, etc. The influence of factors. Therefore, in order to reduce the influence of the above factors on the correction result, the usually adopted correction strategy often requires multiple sets of lat...

AI Technical Summary

Problems solved by technology

Therefore, in order to reduce the impact of the above factors on the calibration results, the commonly used calibration strategy often requires multiple sets of lateral images, which is a waste of time and is likely to cause damage to the radiation source of the three-in-one CBCT machine

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