Composite 3D Surgical Mapping for Metal-Artifact Revision
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Solution Overview
Problem
Current imaging technologies struggle with metal artifact distortion in preoperative images, making accurate surgical planning and implant placement challenging, especially in revision surgeries, and are unable to predict the final 3D surgical anatomy after implant removal.
Innovation Solution
Combining preoperative metal artifact reduction with intraoperative digitization to create a composite 3D surgical structural dataset, using a reference instrument to register and guide surgical reconstruction, incorporating altered and unaltered anatomy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If preoperative imaging is performed with metal implants present, then the surgical field can be visualized for planning, but the metal artifact distorts the image and compromises measurement precision
Solution Approach 1:
The patent applies preliminary action by performing metal artifact reduction processing on preoperative images before surgical planning. This pre-processing step removes or reduces the distorting metal artifacts from CT or MRI images, allowing accurate visualization of the surgical field and surrounding anatomy while the implant is still in place, thereby enabling precise surgical planning without the interference of artifact distortion
Solution Approach 2:
The patent creates a virtual copy of the implant and surrounding anatomy through 3D reconstruction from processed images. This virtual model allows surgeons to plan and simulate the surgical procedure, including implant removal and replacement, without being affected by metal artifacts in the original imaging. The copied geometric data enables accurate measurement and planning independent of artifact distortion
2Reliability
If current metal artifact reduction technologies are used, then some imaging concerns are addressed, but they do not eliminate all problems associated with preoperative imaging and surgical planning
Solution Approach 1:
The patent applies parameter changes by transforming 2D or 3D image data into precise geometric models with defined parameters such as implant position, orientation, dimensions, and surrounding anatomy characteristics. This parameter-based representation converts qualitative image information into quantitative data that can be accurately measured and manipulated, providing complete surgical planning information independent of image quality or artifact reduction effectiveness
3Ease of manufacture
If preoperative imaging is used to plan revision surgery, then surgical planning can be performed, but accurate assessment of surrounding anatomy is difficult due to metal implant artifact
Solution Approach 1:
The patent applies segmentation by separating the implant geometry from the surrounding anatomy in the 3D reconstructed model. This segmentation allows independent analysis and measurement of each component - the implant can be precisely defined while the surrounding bone and soft tissue structures are separately visualized and measured without artifact interference, enabling accurate assessment of both the implant and surrounding anatomy for comprehensive surgical planning
Data Source
AI summary
A method comprises combining one or more pre-operative data sets of an anatomical site in an unaltered condition and one or more intraoperative data sets of the anatomical site in an altered condition to form one or more composite data sets of the anatomical site and using the one or more composite data sets to assist in navigation within the anatomical site in association with one or more surgical processes.