Method for obtaining mid-facial defect target reference data through anatomical feature point matching

Abstract

The invention discloses a method for obtaining mid-facial defect target reference data through anatomical feature point matching, and the method comprises the following steps: selecting, from all CT data of an imaging department, normal human craniomaxillofacial CT data as data in a normal Chinese craniomaxillofacial three-dimensional form database; for all models which meet a database inclusion standard and have complete craniomaxillofacial three-dimensional morphological data, manually marking 70 anatomical mark points of the craniomaxillofacial, and recoding original three-dimensional coordinates Pi (xi, yi, zi) of the anatomical mark points; calculating the weights of all the feature points through an algorithm, and then taking the product of the coordinate distance and the weight corresponding to each feature points as the error corresponding to the feature point; after preoperative CT data of all incorporated patients are obtained, segmenting and removing the displaced fracture blocks, and marking remaining skull anatomical mark points. According to the method, the matching algorithm is improved, the precision of the method is verified through a defect simulation experiment,so that a more accurate mid-facial target data acquisition method is expected to be obtained, the database capacity is expanded, and the precision is verified through the simulation experiment and canbe applied clinically.

Description

technical field [0001] The invention relates to a method for acquiring reference data of a central defect target, in particular to a method for acquiring reference data of a central defect target by matching anatomical feature points. Background technique [0002] The middle part of the face mainly includes bilateral zygomatic and zygomatic arches, eye sockets, bilateral frontal-orbital ethmoid and other structures. The anatomy of soft and hard tissues is complex, and the bone shape is irregular and the bones are thin. Once fractures and defects occur due to trauma, tumors, etc. , It is often difficult to accurately reset, resulting in secondary facial deformities, diplopia, limited mouth opening and other functional obstacles. Surgical treatment of midfacial fractures and defects is mainly aimed at restoring the three-dimensional shape and correcting dysfunction. The surgical method is fracture reduction and bone three-dimensional shape reconstruction. Traditional surgical ...

AI Technical Summary

Problems solved by technology

The first method does not target fractures and defects in the middle of the face, and the data weights of feature points in different regions are not considered, which needs to be optimized

The second method still relies on the mid-face landmarks such as the nasion point, bilateral ear points, and bilateral zygomatic-frontal suture points. It is not applicable to missing landmark points, and the average skull used is Caucasian, and the number of samples is small. not applicable to nationals

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