Method and system for positioning head shadow survey mark point based on CBCT (cone beam computed tomography) volume data

Abstract

The method for positioning the head shadow survey mark point based on the CBCT volume data provided by the embodiment of the invention comprises the following steps: adjusting the CBCT volume data to a head area required by measurement, and determining a head position according to a preset reference plane; presetting a specific section for the anatomical position of each mark point, marking out a range corresponding to the section from the CBCT volume data, and projecting the three-dimensional volume data of the range corresponding to the section into two-dimensional data; and determining each mark point in sequence, and displaying a two-dimensional image converted from the projection data of the corresponding section so as to position the mark points in the head shadow survey. The invention further provides a corresponding system. According to the method, aiming at the anatomical characteristics of each mark point, one part of CBCT volume data is converted into two-dimensional data, CBCT three-dimensional volume data can be fully utilized, meanwhile, overlapping and interference of anatomical structures are eliminated, and accurate positioning of the mark points is carried out. The accuracy and efficiency of the fixed point of the head shadow survey mark after CBCT conversion of the two-dimensional projection data are improved through a simple method, and the method has great clinical application value.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of medical image processing, belongs to the technical field of cephalometric measurement, and is often used in stomatology, especially in orthodontics and orthognathic surgery, and specifically relates to a cephalometric marker point based on CBCT volume data Positioning method and system. Background technique [0002] Cephalometric technology is to measure relevant points and lines on the X-ray head film, and then analyze the shape, size, position and mutual relationship of teeth, jaw, and craniofacial soft and hard tissues. Since the middle of the 20th century, X-ray cephalometric measurement has been widely used in clinical diagnosis, treatment design, and curative effect evaluation of orthodontics and oral and maxillofacial surgery. It is also widely used in the observation of head and face structure and children's growth and development etc. research. [0003] In the past, tr...

AI Technical Summary

Problems solved by technology

Although the clarity of CBCT-transformed slides is much higher than that of traditional X-ray plain films, it is still impossible to avoid the interference of image overlapping on fixed points

The second is the level of understanding of the anatomical structure of the X-ray images and the experience of the analysts, which requires long-term repeated application or special training for doctors to gradually improve, and the root cause is still the difficulty in identifying landmarks caused by overlapping images

The existing more accurate method is to use the MPR image of CBCT (MPR: Multiplanar Reformation, multi-planar reconstruction), carry out cross-reference fixed points on the three planes of coronal plane, sagittal plane and axial plane, and project it to the sagittal plane, but This method is extremely cumbersome and time-consuming, and can only be used to accurately locate some anatomical landmark points. It cannot effectively locate points that do not exist in the three-dimensional structure and are obtained by overlapping and intersecting structures in the two-dimensional image.

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