Damaged bone repair modeling method based on contour sample library matching and template guiding

Abstract

The invention discloses a damaged bone repair modeling method based on contour sample library matching and template guiding. The method comprises the following steps: 1, after inputting damaged skeleton tomographic image data, segmenting and processing a damaged skeleton tomographic image, and extracting a target skeleton contour; 2, performing defect contour identification and defect characteristic information calibration; 3, repairing an individual defect contour matched based on the fault contour sample library; and 4, reconstructing a skeleton 3D model based on the repaired contour sequence. The method has important significance in making a preoperative planning scheme, designing a personalized implant, analyzing a three-dimensional finite element of a skeleton and the like in a computer-aided bone surgery clinical fracture operation.

Description

technical field [0001] The invention belongs to the technical field of digital orthopedics and computer aided design, in particular to a damaged bone repair modeling method based on contour sample library matching and template guidance. Background technique [0002] In clinical orthopedic surgery, professional doctors usually need to build a three-dimensional model based on the tomographic image sequence of the affected bone obtained by the radiology department, and repair the damaged bone caused by fracture or lesion. It is of great significance to formulate preoperative planning scheme, design of personalized implant and its type selection, finite element analysis, etc. At present, common damaged bone repair techniques mainly include geometric mosaic method, mirror repair method based on the symmetry of the bone itself or the opposite intact bone, and template-based registration deformation method. However, due to the complex and diverse human bone structure, The location...

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Problems solved by technology

Therefore, it is difficult to repair by relying on the matching of the geometry between the damaged blocks at the damaged end

[0004] Second, the main problems of the mirror image repair method are: not all bones have symmetry or contralateral bone; if there is a certain degree of defect on both sides of symmetry, mirror image repair is difficult; some individuals have local characteristics on both sides of symmetry. The difference is large; the acquisition of tomographic image data of the contralateral bone increases the radiation dose of the patient and brings certain physical harm to the patient

[0005] Third, the main problem of the template registration deformation repair method is that the constraint deformation between the part and the whole is relatively complex, and it is difficult to distinguish the differences in the characteristics of individual local regions only through the deformation of the template to repair the damaged area

[0006] Recently, some researchers have proposed a repair method based on the maximum common subimage and ICP point cloud registration, but it is limited by the fracture situation of the diaphysis of long bones, and it is difficult to promote; some researchers have also proposed a repair method based on semantic parameter measurement and 3D model samples The library matching method is used to repair, but it directly repairs the damaged area by transplanting the 3D model of the corresponding area that best matches the sample. The transplanting granularity is relatively large, and the repair is relatively rough. It is difficult to distinguish the differences in the characteristics of local areas between individuals.

[0007] To sum up, most of the current repair technologies are repaired on the 3D model of the damaged bone, and there are problems such as rough repair and difficulty in distinguishing the differences in the details of individual local areas.

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