Surface Point Validation for Accurate Medical Navigation Registration
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Solution Overview
Problem
Existing surface-based image registration methods in medical navigation systems face challenges with measurement errors due to contact-based methods and the inability of contact-free methods to acquire points on covered regions, such as those obscured by hair.
Innovation Solution
A method for sampling relevant surface points by determining and validating surface points based on tissue type, using a registration device to identify and discard non-relevant points, thereby improving surface geometry acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contact-based methods are used to acquire surface points, then points can be acquired on covered regions, but measurement errors occur since points are acquired above or below the actual surface
Solution Approach 1:
The patent introduces an intermediary validation process that acts as a mediator between contact-based point acquisition and final surface geometry. The validation step uses multiple criteria (spatial consistency, normal vector alignment, distance thresholds) to filter out erroneous points, allowing the system to benefit from contact-based method's ability to access covered regions while eliminating its measurement errors through systematic validation
2Measurement precision
If contact-free methods are used to acquire surface points, then measurement accuracy is improved, but points cannot be acquired on covered regions such as those obscured by hair
Solution Approach 1:
The patent creates a universal point acquisition system that combines both contact-based and contact-free methods into a single multi-functional framework. The system can adaptively switch between or combine these methods depending on the specific anatomical region and coverage conditions, making the overall system capable of handling both exposed and covered regions while maintaining accuracy through the validation mechanism
3Quantity of substance
If all acquired surface points are used for registration, then data completeness is improved, but accuracy decreases due to inclusion of non-relevant points from covered regions
Solution Approach 1:
The patent applies local quality by implementing spatially-varying validation criteria that adapt to different anatomical regions. The validation process considers local context such as expected surface curvature, normal vector directions, and distance from the probe, allowing the system to accept points in appropriate regions while rejecting points from covered or erroneous regions, thus achieving both quantity and quality
Data Source
AI summary
A method and a registration device for sampling relevant surface points of a subject for a medical navigation system is presented. From a plurality of surface points of the subject, relevant surface points are accepted and non-relevant surface points are discarded. The method allows the surface geometry acquisition of a subject to be improved. For this purpose, additional information of the surface points is acquired and assigned to the respective surface point for validating each surface point.