Prior knowledge-based method for reconstructing artificial bone repair model of damaged part

Abstract

The invention discloses a prior knowledge-based method for reconstructing the artificial bone repair model of a damaged part. According to the method, firstly, a skeleton outer contour is extracted from a medical tomographic CT image, and a repairing template is introduced. Meanwhile, a contour line is re-sampled from the repairing template according to the thickness of a broken layer. Secondly, atemplate layer which is the most matched with a to-be-repaired layer is searched out of the repairing template by utilizing a characteristic value method, and the template layer and the to-be-repaired layer are aligned and transformed. Thirdly, the isomorphic points of the breakpoint of the to-be-repaired layer are obtained on the template layer through a common included angle method, and a fitting equation between isomorphic points is calculated. The values are reversely substituted into a fitting equation and then the coordinate of the interpolation point of the to-be-repaired layer can beobtained. Fourthly, an inner contour is generated according to the given thicknesses of the inner and outer layers of the bone. Finally, an artificial bone repair model is obtained by utilizing the VTK three-dimensional reconstruction. The method disclosed by the invention is applied to the actual implantation operative procedure of personalized artificial bones when cranial bones are broken too seriously to be directly repaired by the surgical operation after human frontal bones, parietal bones and other parts are heavily damaged.

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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