A method and system for rough registration of broken bone model and method for registration of broken bone model

Abstract

The present invention provides a method and system for rough registration of broken bone models and a method for registration of broken bone models, including: reconstructing CT images of fractured bones to obtain a set of broken bone models; correspondingly extracting point clouds on each broken bone model data, convert each broken bone model into the corresponding broken bone point cloud model; correspondingly calculate the rotation matrix and displacement matrix between each broken bone point cloud model and the sample bone point cloud model; The corresponding rotation matrices and displacement matrices are shifted and rotated to obtain the broken bone point cloud model after the displacement and rotation of each broken bone point cloud model, and the rough registration is completed. The invention is used to realize the registration of broken bone models that cannot provide an axis, and is used to realize the registration of more than one broken bone models, thereby helping to improve the registration accuracy.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and system for rough registration of a broken bone model and a method for registration of a broken bone model. Background technique [0002] In recent years, computer-assisted orthopedic technology has become a popular research. It extracts information about the bones from the CT images of the patient's fractured bones for 3D reconstruction, obtains the patient's broken bone model, and then registers the patient's broken bone model. Thus, the complete skeleton model corresponding to the fractured bone is obtained. [0003] In the actual registration process, the fractured bone model needs to be preprocessed, that is, rough registration. At present, there are two main methods of coarse registration, one is to use the bone axis to align the bones, and the other is to use the local model to match the overall model. For the method of using the bone axis to align t...

AI Technical Summary

Problems solved by technology

When applied to bone model matching, since human bones are similar in shape, other people's bones can be used as sample bones for matching, and certain results can be achieved. However, when faced with size differences between two bones, To some extent, it will lead to wrong matching results

In most cases, there will be differences in size between different human bones, which will affect the matching accuracy to a certain extent.

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