Orthognathic Surgery Planning with 3D Cephalogram Fusion
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Solution Overview
Problem
Current methods for maxillofacial surgery planning, particularly orthognathic surgery, rely on manual two-dimensional simulations and lack a suitable framework for accurately repositioning bone fragments in three-dimensional environments, with 3D surface representations failing to provide anatomically relevant references and being affected by artifacts from dental amalgam fillings.
Innovation Solution
A method and device for performing cephalometric and anthropometric analysis using 3D scans to generate anatomically relevant frameworks, allowing for accurate virtual repositioning of bone fragments and fusion of 3D surface models with 2D cephalograms, along with the use of 3D splints to enhance imaging and reduce radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If 3D surface representations are used for orthognathic surgery planning, then the visualization capability is improved, but artifacts from dental amalgam fillings degrade the image quality and prevent accurate tooth positioning
Solution Approach 1:
The patent extracts and removes the harmful amalgam artifacts from the CT images through image processing techniques. By identifying and eliminating these artifacts, the system recovers the underlying tooth structure information that would otherwise be obscured, enabling accurate 3D visualization and occlusion analysis without the degrading effects of metal streaks
Solution Approach 2:
The patent introduces an intermediary processing layer between the raw CT data and the final 3D visualization. This intermediary step involves specialized image processing algorithms that mediate the transition from artifact-contaminated images to clean, accurate 3D surface models, allowing the system to overcome the limitations of metal artifacts in CT imaging
2Ease of manufacture
If manual two-dimensional simulations are used for surgery planning, then the process is simpler to implement, but the accuracy and reliability of bone fragment repositioning is insufficient
Solution Approach 1:
The patent transitions from two-dimensional manual simulations to three-dimensional computer-based planning systems. By adding the third dimension, the system provides accurate spatial representation and manipulation of bone fragments, enabling precise repositioning planning while maintaining user-friendly interaction through graphical interfaces
Solution Approach 2:
The patent replaces manual mechanical tracing methods with automated computer-based image processing and 3D modeling systems. This substitution eliminates the limitations of manual 2D methods while providing automated, precise measurements and visualizations that improve both accuracy and efficiency in surgical planning
3Manufacturing precision
If 3D surface models are generated from CT scans, then the anatomical detail is improved, but the presence of amalgam artifacts prevents accurate tooth position plotting
Solution Approach 1:
The patent converts the harmful effect of amalgam artifacts into a beneficial process by using the artifacts as identification markers to locate tooth positions. The image processing system recognizes artifact patterns and uses them as reference points to reconstruct accurate tooth positions, transforming the problem of metal artifacts into an opportunity for enhanced localization accuracy
Data Source
AI summary
The present invention is related to a method for performing a cephalometric or anthropometric analysis comprising the steps of: acquiring a 3D scan of a person's head using a 3D medical image modality, generating a 3D surface model using data from the 3D scan, generating from the 3D scan at least one 2D cephalogram geometrically linked to the 3D surface model, indicating anatomical landmarks on the at least one 2D cephalogram and/or on the 3D surface model, performing the analysis using the anatomical landmarks.