Ankle joint skeletal morphological parameter measuring method based on three-dimensional imaging technology

Abstract

The invention relates to an ankle joint skeletal morphological parameter measuring method based on a three-dimensional imaging technology. The ankle joint skeletal morphological parameter measuring method comprises the following steps of S1, acquiring thin-layer computerized tomography data of an ankle joint; S2, reconstructing a three-dimensional model of the ankle joint according to the thin-layer computerized tomography data by adopting a surface covering reconstruction method; S3, performing image segmentation on a three-dimensional image, and segmenting the ankle joint into three parts, namely a tibia, a fibula, a talus and a bone structure farther than the tibia; S4, selecting an anatomical identification point on the segmented three-dimensional image; and S5, based on the three-dimensional image, obtaining ankle joint morphological parameters through a three-dimensional space point, line, plane and curved surface four-element combined measurement mode. The method has the advantages that anatomical identification point is accurate in selection and good in consistency, and different observers can perform uniform anatomical identification point selection under a direct view ofthe three-dimensional image; the bones are segmented, and related areas of the ankle joint bony structure are fully exposed; the anatomical identification points are selected quickly and accurately, so that the measurement method is efficient, convenient and reliable, and capable of performing repeated measurement.

Description

technical field [0001] The invention relates to the technical field of ankle joint measurement, in particular to a method for measuring ankle bone morphological parameters based on three-dimensional imaging technology. Background technique [0002] Accurate preoperative planning of ankle fractures, imaging evaluation of anatomical reduction, and design of anatomical internal fixation devices all rely on a large number of accurate and detailed morphological quantitative indicators. The existing methods for measuring parameters related to the bony structure of the ankle generally include: 1) Anatomical measurement based on cadaver specimens; 2) Two-dimensional measurement based on X-ray films; 3) Based on computerized tomography (Computed Tomography, CT) images and post-processing techniques for two-dimensional measurement. However, the above three measurement methods all have certain defects. First of all, the anatomical measurement mode based on cadaver specimens is diffic...

AI Technical Summary

Problems solved by technology

First of all, the anatomical measurement mode based on cadaver specimens is difficult to measure large samples due to the difficulty in obtaining cadaver samples

Secondly, based on the measurement mode of X-ray film, X-ray film measurement has great limitations due to factors such as foot position, ball tube projection angle difference, bony structure overlap, manual measurement error and other factors in different patients.

Third, the two-dimensional measurement mode based on multi-plane reconstructed CT images has the following defects: (1) There are differences in the placement of limbs during CT scanning, and the layer selection of CT multi-plane reconstructed images is greatly affected by subjective factors. It is difficult to select completely consistent slices on different samples; (2) Even the bony anatomical structures of CT multi-planar reconstruction images of adjacent slices have certain differences; (3) The relevant anatomical landmarks are not obvious on the two-dimensional CT images, The selection of reference points is difficult to unify; (4) It is impossible to select anatomical marker points at different two-dimensional levels for three-dimensional space measurement

Finally, based on the measurement mode of the 2D output CT 3D reconstruction image, since the best viewing angle of the image cannot be independently selected by the doctor, anatomical landmarks at different viewing angles cannot be selected at the same time, and it is also impossible to realize 3D on the 2D output image. measurement of space

[0003] To sum up, it is difficult to freely choose the observation angle, accurately select the anatomical landmarks, and the reliability and repeatability of the measurement results are low, resulting in limited reference value of the measurement results

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