Bone shape averaging-oriented femoral model registration method

Abstract

The invention discloses a bone shape averaging-oriented femoral model registration method. The method includes the following steps: step 1, selecting a plurality of similar bone models as samples; preprocessing the model by adopting a bilateral filtering algorithm based on a surface normal direction; extracting skeleton surface geometric feature points based on the normal vector and the curvature,and creating a geometric feature model; step 2, solving the centroid of each sample model, solving an initial transformation matrix, and realizing centroid alignment of the sample models; adopting arigid registration algorithm, rotating the geometrical characteristic models of other samples to a reference model, solving a geometrical deformation matrix, and realizing preliminary registration ofgeometrical characteristics; step 3, fitting to create bone internal feature points; extracting significant feature points with medical semantics on the surface of the bone, and constructing anatomical feature points based on the internal and surface feature points; solving a skeleton fine registration transformation matrix; and performing rigid transformation on the initial skeleton model according to the initial matrix, the geometric matrix and the fine matrix to realize automatic alignment of the sample skeleton model.

Description

technical field [0001] The invention relates to a registration method of a femur model, in particular to a registration method of a femur model oriented to bone shape averaging. Background technique [0002] In the surgical treatment of human bone lesions and necrosis, bone prosthesis implantation has become one of the important methods for orthopedic surgical treatment and recovery of patient's activities. The averaged bone model provides an important reference for the representation of typical bone shape and prosthesis design of the same population. An important prerequisite for the construction of the averaged bone model is to register multiple bone sample models to a unified coordinate system, that is, to achieve anatomical alignment of the bone model. Existing related work mainly relies on rigid registration at the purely geometric level, and is oriented towards the anatomical alignment of large-scale point cloud data models. Modeling is time-consuming and inefficient;...

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Problems solved by technology

Existing related work mainly relies on rigid registration at the purely geometric level, and is oriented towards the anatomical alignment of large-scale point cloud data models. Modeling is time-consuming and inefficient; second, the lack of description of bone anatomical features makes it difficult to ensure the medical semantics of model registration results

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