A method and device for micro-ct image analysis and quantitative evaluation of molar alveolar bone

Abstract

The invention discloses a method for conducting Micro-CT image analysis and quantitative evaluation on an alveolar bone of a molar. The method includes the following steps of obtaining a Micro-CT image containing the images of the alveolar bone and a tooth of the molar to be analyzed, separating the image of the tooth and the image of the alveolar bone, conducting 3D calculation on the image of the tooth to obtain a 3D image of the tooth, determining the interested area through the spherical surrounding method, making the average value of the distance between the center point of the root forky part of the molar to be analyzed and the center point of an apical foramen of a mesial root serve as the spherical radius r of a spherical surrounding area, adjusting the center of the spherical surrounding area to the center of the root forky part of the molar to be analyzed, and changing the 2D spherical surrounding area into a 3D spherical surrounding area, finally conducting 3D calculation on the interested area and the image of the alveolar bone in the interested area to obtain the total size of the interested area, the size of bone trabeculae of the alveolar bone in the interested area, and the bone surface area, and calculating the number, thickness and separation degree of the bone trabeculae of the alveolar bone in the interested area, and the structural model index according to the total size of the interested area, the size of the bone trabeculae and the bone surface area.

Description

technical field [0001] The invention relates to the field of computer-aided evaluation of alveolar bone, in particular to a method and device for quantitative evaluation of molar periodontitis residual alveolar bone by Micro-CT image analysis. Background technique [0002] The alveolar bone, also known as the alveolar process, is the part of the upper and lower jaw that surrounds and supports the roots of the teeth. Alveolar bone resorption is the main manifestation and diagnostic standard of periodontitis, alveolar bone resorption is mainly manifested in the reduction of alveolar bone height and alveolar bone density. Since the inner and outer bone plates of the alveolar bone are composed of cortical bone with spongy bone in the middle, the labial and buccal bone plates of the alveolar bone are thinner, and there are many small holes leading to the cancellous bone inside. Therefore, alveolar bone is non-uniform, porous structure with air, and its bone density is very close...

AI Technical Summary

Problems solved by technology

The 3D region of interest (ROI) boundary of this method is fixed on the 2D slice first, and then the volume parameter analysis is performed after 3D reconstruction; however, the above-mentioned anatomical landmarks cannot be displayed on the same 2D slice, so There will be difficulties and errors in fixed points, and the workload is large, the actual operation is more difficult, and the repeatability and accuracy are not high ( Journal of periodontal research, 2011; Trombettae, Journal of dental research, 2011; Bak, Journal of periodontology, 2010, etc.)

In 2007, Park et al. of the University of Michigan proposed a manual method for evaluating 2D and 3D alveolar bone resorption in experimental periodontitis, which is relatively accurate and has certain repeatability, but the procedure is cumbersome, the degree of automation is low, and the actual operability is poor. (Park, Journal of Periodontology, 2007)

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