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Knee joint replacement space registration system based on multi-modal fusion and point cloud registration

A technology for knee replacement surgery and point cloud registration, which is applied in the field of knee replacement surgery space registration system, can solve the problems of long space registration time and reduce registration time, so as to achieve good preoperative planning, reduce operation time, The effect of reducing the degree of dependence

Inactive Publication Date: 2021-05-25
FUDAN UNIV
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  • Application Information

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Problems solved by technology

[0021] In order to solve the problem of too long space registration time in computer-navigated knee replacement surgery, this invention proposes a knee replacement space registration system based on multi-modal information fusion and point cloud registration, which can maintain a high registration Accuracy, can also significantly reduce the time spent on registration

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  • Knee joint replacement space registration system based on multi-modal fusion and point cloud registration
  • Knee joint replacement space registration system based on multi-modal fusion and point cloud registration
  • Knee joint replacement space registration system based on multi-modal fusion and point cloud registration

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Embodiment Construction

[0052] The present invention is further described below in conjunction with embodiment and accompanying drawing.

[0053] Taking the femur as an example, the application process of the registration system of the present invention is as follows Figure 4 shown.

[0054] Module I is the process of enhancing the CT image before operation and obtaining the spatial coordinates of the point cloud of the preoperative cartilage surface. Segment hard bone and cartilage from preoperative CT and MR images respectively, and obtain the registration transformation matrix T of CT and MR at the same time mr→ct . The transformation matrix obtained by registration is applied to the soft and hard bone labels obtained by segmentation, and the fusion structure of soft and hard bone labels can be obtained. After three-dimensional reconstruction, a model with cartilage is obtained, which will be used for intraoperative navigation, and cartilage can be extracted from it Surface point cloud P imag...

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Abstract

The invention belongs to the technical field of medical equipment, and particularly relates to a knee arthroplasty space registration system based on multi-modal fusion and point cloud registration. The system comprises three modules: a space coordinate construction module of knee joint cartilage surface point cloud on a CT image; an intraoperative patient space knee joint cartilage surface point cloud acquisition module; and a knee joint cartilage surface point cloud layering registration module which achieves spatial registration of an intraoperative patient and a preoperative image, wherein the registration error is about 2.5 mm. According to the invention, the registration time in the operation can be greatly reduced, generally about 2 minutes are used, so that the operation time is greatly reduced; soft tissue information can be provided by utilizing the CT and MR images fused before the operation, so that a doctor can perform better pre-operation planning and intraoperative incision position judgment according to the soft tissue information; in addition, the degree of dependence on doctors can be greatly reduced, and the doctors can concentrate on the operation.

Description

technical field [0001] The invention belongs to the technical field of medical equipment, and in particular relates to a space registration system for knee joint replacement. Background technique [0002] Existing knee replacement systems often perform navigation based on intraoperative registration of marker points, which involves the selection and confirmation of multiple marker points, and takes a long time for registration, resulting in prolongation of operation time. [0003] Image-guided computer-assisted knee replacement surgery can help doctors perform surgery better [1]. Among them, spatial registration technology is one of the most important key technologies of surgical navigation, and it is also one of the main factors restricting clinical end-to-end accuracy, and it also affects the time of surgical navigation [2]. [0004] At present, the spatial registration technology in knee orthopedic navigation is mainly divided into three categories [1]: registration base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B34/10A61B90/00A61B34/20
CPCA61B34/10A61B90/36A61B90/37A61B34/20A61B2034/101A61B2090/374A61B2090/3762A61B2034/105
Inventor 史勇红姚德民刘颜静
Owner FUDAN UNIV
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