Artificial bone repair model reconstruction method based on prior knowledge

Abstract

The invention discloses a method for reconstructing an artificial bone repair model of a damaged part based on prior knowledge. First, extract the outline of the outer layer of the bone from the medical tomographic CT image, introduce the repair template and resample the contour line from the repair template according to the thickness of the fault layer; secondly, use the eigenvalue method to search for the most matching layer in the repair template The template layer and establish the alignment transformation of the two; then, obtain the isomorphic points on the template layer and the breakpoints of the layer to be repaired by the public angle method, and calculate the fitting equation between the isomorphic points, reversely substitute into the fitting equation to obtain the The point coordinates of the repair layer are interpolated; then, the inner layer contour is generated according to the given bone inner and outer layer thickness; finally, the artificial bone repair model is obtained by using VTK 3D reconstruction. The invention is applied to the actual surgical operation in which the human frontal bone, parietal bone and other parts are severely damaged, resulting in severe fracture of the skull that cannot be repaired directly, and needs to be implanted with personalized artificial bones.

Description

technical field [0001] The invention belongs to the technical field of computer graphics, and is particularly suitable for the three-dimensional design of an artificial bone repair model for repairing damaged parts of the skull. Background technique [0002] The use of artificial bones to repair skull injuries is suitable for clinical operations where the skull is severely damaged and cannot be directly spliced ​​through existing bone fragments. The design of the three-dimensional artificial bone repair model must be consistent with the location and size of the lesion. For the case of comminuted damage, doctors cannot obtain a rough shape through the repair of broken bones as a reference for artificial bone design. The template is often used as an auxiliary tool in 3D reconstruction. The template here can be the reconstruction result of existing healthy bones, or the averaged virtual reconstruction result. There are many literatures at home and abroad dedicated to using tem...

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Problems solved by technology

[0004] In order to solve the above-mentioned defects and deficiencies in the prior art, the present invention provides a method for reconstructing artificial bone repair models of damaged parts based on prior knowledge, aiming at comminuted fractures in the frontal bone, parietal bone and other parts of the human skull after severe trauma If the skull fragmentation is too serious to be directly repaired by surgery, the global similarity of different human skulls and bones can be used; the sequence and local similarity between medical tomographic images; the continuity of the extracted bone contours, etc. Automatically obtain the 3D bone model of the fracture site as prior knowledge, and provide a data basis for later personalized artificial bone repair surgery

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