Femur Image Registration Using Coordinate Points for Surgical Navigation
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Solution Overview
Problem
Current navigation systems for femur surgery face challenges in accurate registration of three-dimensional and two-dimensional images, leading to inaccuracies in surgical navigation and reduced surgery quality.
Innovation Solution
An image registration system and method that includes a projection module for DRR projections at different angles, a preprocessing module for generating femoral coordinate systems and characteristic points, and a registration module for aligning two-dimensional DRR and X-ray images using femoral coordinate systems and characteristic points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three-dimensional-two-dimensional image registration is used for navigation, then navigation accuracy is improved, but registration precision deteriorates
Solution Approach 1:
The patent segments the registration process into multiple stages: first extracting characteristic points from both 3D CT images and 2D X-ray images, then establishing coordinate systems based on these points, and finally performing registration through coordinate transformation. This segmentation allows each stage to be optimized independently, improving overall registration precision while maintaining navigation accuracy.
Solution Approach 2:
The patent performs preliminary processing by extracting characteristic points and establishing coordinate systems before the actual registration. This preliminary action prepares the data in advance, ensuring that when registration is performed, the precision is maximized because all necessary transformations and alignments are pre-calculated based on accurate feature extraction.
2Ease of manufacture
If preoperative navigation system based on CT data is used, then surgical planning is improved, but intraoperative spatial positioning capability is lost
Solution Approach 1:
The patent creates a universal navigation system that can perform both preoperative planning and intraoperative spatial positioning using the same core technology of three-dimensional-two-dimensional image registration. The system uses 3D CT images for planning and 2D X-ray images for intraoperative positioning, with the registration technology serving as the bridge between both functions, making the system multi-functional and adaptable to different surgical phases.
3Adaptability or versatility
If intraoperative imaging navigation system based on C-shaped arm X-ray machine is used, then intraoperative positioning is improved, but visual clarity deteriorates
Solution Approach 1:
The patent introduces 3D CT images as an intermediary that provides high-visual-clarity anatomical information. The system combines this 3D visual data with 2D X-ray images through the registration technology, allowing the 3D CT images to serve as a reference framework that enhances visual clarity while the 2D X-ray images provide the necessary intraoperative positioning capability. The intermediary 3D data resolves the contradiction by providing both clarity and positioning information.
Data Source
AI summary
An image registration system and a method for a femur surgery relates to the field of surgery image registration are provided, before a surgery, DRR projections at different angles are carried out of a three-dimensional femur CT image, femoral coordinate systems and femoral characteristic points are respectively generated and selected on a the two-dimensional DRR projection images and two-dimensional X-ray images. Based on the femoral coordinate systems and the femoral characteristic points, the two-dimensional DRR projection images and the two-dimensional X-ray images are registered, so that the image registration precision is improved, a two-dimensional DRR projection image in the same femoral posture as a femoral posture during a two-dimensional X-ray image scanning can be accurately obtained, which can obtain a real surgical path for surgical navigation, ensures the precision of surgery-assisted navigation, and further improves the surgery quality.