Method and equipment for registering orthodontic front and back skull side position films

Abstract

The invention provides a method and equipment for registering orthodontic front and back skull side position films. A computer is adopted to assist skull side position film point marking and contour drawing, and compared with traditional parchment paper drawing, point marking and contour drawing are more convenient and faster, and storage and communication are easier; Computer-assisted angle and linear index measurement is adopted, and compared with manual measurement, errors caused by a measuring instrument and long consumed time in the measurement process, the measurement is more accurate and rapid; An iterative nearest point algorithm with scales is adopted, the problem of scale change caused by different body position and shooting parameter settings is solved, maximum correlation entropy measurement is introduced, noise caused by individual manual punctuation errors is reduced, and the accuracy of a registration result is improved compared with the prior art that only images on naked eyes are basically overlapped.

Description

technical field [0001] The invention relates to the technical field of cephalometric orthodontics, in particular to a registration method and equipment for cephalometric images before and after orthodontics. Background technique [0002] Cephalometric radiographs were studied and invented by Broadbent in 1931 to evaluate the relationship between teeth and bones, soft tissues and hard tissues in the midsagittal plane. For a long time, manual fixed points and manual drawing were the only way to outline the structure of maxillofacial tissue and measure angle and linear index. The manual drawing method is to mark the soft and hard tissue landmarks and outlines on the sulfuric acid paper with better light transmission under the film viewing lamp. However, the accuracy and repeatability are very important for the manual tracing method, which has high requirements for the printing quality and color contrast of lateral images. Studies have shown that there are significant differen...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the traditional method in the prior art, in orthodontics, draw the contours of signs before and after orthodontic treatment with sulfuric acid paper, and then use computer-aided cephalometric measurement before and after treatment to measure the overlap, and use the fuzzy vector method to test the length of each corresponding vector set of images before and after treatment. In the case of matching with the direction, there are problems that the sulfuric acid paper used for surveying and mapping is easily damaged, the drawing results are not easy to store, the overlapping accuracy is low, and the noise cannot be effectively controlled. This method can improve the efficiency of punctuation and contour drawing on cephalometric films, facilitate storage and communication, greatly reduce overlapping errors, and improve the accuracy of registration results

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