Broken bone model coarse registration method and system and broken bone model registration method

Abstract

The invention provides a broken bone model coarse registration method, a broken bone model coarse registration system and a broken bone model registration method. The broken bone model coarse registration method comprises the following steps: reconstructing a CT image of a fractured bone to obtain a group of broken bone models; correspondingly extracting point cloud data on each broken bone model, and respectively converting each broken bone model into a corresponding broken bone point cloud model; correspondingly calculating a rotation matrix and a displacement matrix between each broken bone point cloud model and the sample bone point cloud model; and performing displacement rotation on each broken bone point cloud model according to the respective corresponding rotation matrix and displacement matrix to obtain a broken bone point cloud model of each broken bone point cloud model after displacement rotation, and completing coarse registration. The broken bone model registration method and device are used for realizing registration of broken bone models which cannot provide axes and realizing registration of broken bone models in a one-to-many manner, thereby facilitating improvement of registration precision.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a rough registration method and system for a broken bone model and a registration method for a broken bone model. Background technique [0002] In recent years, computer-aided orthopedic technology has become a popular research. It extracts information about the bone from the CT image of the patient's fractured bone for three-dimensional reconstruction, obtains the patient's broken bone model, and then registers the patient's broken bone model. Thus, the complete bone model corresponding to the fracture bone is obtained. [0003] In the actual registration process, the broken bone model needs to be preprocessed, that is, coarse registration. At present, there are mainly two coarse registration methods, 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 aligning bones using the axis of th...

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.

Images