3D Tissue Model Dynamic Visual Rendering
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Solution Overview
Problem
Current systems for assisting surgeons during catheterization procedures lack effective visual representations to accurately guide the catheter probe in relation to the tissue surface, particularly in terms of position, orientation, and the effects of the procedure on the tissue.
Innovation Solution
A method and system that graphically present a 3-D model of a tissue surface with a deformed indicating marker, congruent with the tissue shape, to indicate the catheter probe's position and orientation, and simulate the effects of the procedure, such as temperature changes and lesion spread, in real-time, using dynamic visual representations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a 3-D model with deformed indicating markers is rendered in real-time, then the visualization accuracy and surgical guidance precision are improved, but the computational complexity and processing time increase
Solution Approach 1:
The system performs preliminary actions by pre-processing the 3-D tissue model and pre-defining multiple indicating markers at different positions and orientations before the surgical procedure begins. This allows the rendering engine to quickly composite these pre-prepared elements during real-time surgery without performing complex deformations on the fly, thus maintaining high visualization accuracy while reducing computational complexity during the actual procedure.
Solution Approach 2:
The system implements dynamics by making the indicating markers adaptive and responsive to the actual surgical conditions. The markers are dynamically positioned and oriented based on the real-time location and orientation of the catheter probe, and their appearance is dynamically adjusted to match the 3-D tissue surface geometry. This dynamic adaptation ensures continuous accuracy without requiring complete re-rendering of complex deformations.
2Loss of information
If multiple indicating markers are used to show catheter position and orientation, then the information completeness is improved, but the visual clutter and interpretation difficulty increase
Solution Approach 1:
The system applies segmentation by dividing the indication information into multiple distinct markers, each responsible for representing specific parameters such as catheter position, orientation, and procedural effects. Each marker is visually distinct and positioned at relevant locations on the 3-D tissue model, allowing surgeons to interpret different aspects of catheter status separately rather than overwhelming them with a single complex visualization.
Solution Approach 2:
The system implements local quality by placing different types of indicating markers at different locations on the 3-D tissue model based on where they are most relevant. For example, position markers are placed at the catheter tip location, orientation markers are positioned to show probe angle relative to tissue surface, and effect markers are placed at sites of thermal or mechanical impact. This localized placement ensures information completeness while maintaining visual clarity by showing only relevant information at each location.
3Manufacturing precision
If the indicating marker is deformed to match the 3-D model surface, then the congruence and accuracy are improved, but the rendering time and computational resources increase
Solution Approach 1:
The system performs preliminary actions by pre-computing and storing the geometric characteristics of the 3-D tissue model surface, including curvature, normal vectors, and surface topology. These pre-computed geometric data are used to quickly deform indicating markers to match the surface geometry during real-time rendering, achieving high congruence accuracy without performing computationally intensive surface matching calculations during the surgical procedure.
Solution Approach 2:
The system applies copying by creating simplified geometric representations or proxies of the indicating markers that can be easily deformed to match the 3-D model surface. Instead of performing complex real-time surface deformation on high-resolution markers, the system uses lower-resolution proxy markers for deformation calculations, then maps the deformation results to the final high-resolution marker display. This copying approach maintains visual congruence while significantly reducing computational resources and rendering time.
Data Source
AI summary
Disclosed herein is a method of graphically presenting an indicating marker over a 3-D model of a tissue surface during a catheterization procedure, comprising determining a region over the 3-D model, deforming the indicating marker to congruently match a shape defined by the 3-D model across the region at a plurality of positions; and rendering the 3-D model into an image including the deformed indicating marker by generating an image of the 3-D model covered by said deformed indicating marker.