Anatomical Map Correction via Virtual Sphere Point Exclusion
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Solution Overview
Problem
Conventional anatomical mapping techniques face challenges in accurately removing spurious points from models of anatomical volumes, such as heart chambers, due to respiratory movement or excess force applied by probes, which can compromise model accuracy and require post-processing deformation.
Innovation Solution
The system employs a processor to operate in point-removal mode, allowing real-time correction by removing points corresponding to spurious locations, and uses virtual spheres to exclude points from the point cloud, regenerating the surface to ensure accuracy without deformation, and can switch between point-addition and point-removal modes based on user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional anatomical mapping techniques are used to collect data points during probe insertion, then the anatomical map can be generated, but spurious points are introduced due to respiratory movement or excess force applied by the probe
Solution Approach 1:
The system performs preliminary identification of spurious points during the mapping process itself, rather than waiting for post-processing. The processor identifies points that do not correspond to actual anatomical surface locations before finalizing the anatomical map, preventing these spurious points from compromising the final model accuracy.
Solution Approach 2:
The system uses the probe's own operational characteristics to identify spurious points. By analyzing the relationship between probe position data and the generated point cloud, the system automatically detects when points were acquired under improper conditions (excess force, respiratory movement) without requiring external intervention or additional sensors.
2Measurement precision
If post-processing deformation is applied to remove spurious points, then model accuracy can be improved, but the complexity of the processing workflow increases
Solution Approach 1:
The system performs the correction action in advance during data acquisition rather than as a separate post-processing step. Spurious points are identified and handled during the mapping procedure itself, integrating the correction functionality into the existing workflow without requiring additional post-processing deformation steps.
3Measurement precision
If the probe applies excess force to obtain clear signal readings, then data quality improves, but the anatomical surface may be deformed creating spurious points
Solution Approach 1:
The system provides feedback by comparing the probe position data with the generated point cloud to identify inconsistencies. When a point is identified as spurious (not corresponding to the actual anatomical surface), the system can indicate this to the operator, allowing adjustment of probe application force in real-time to prevent surface deformation while maintaining signal quality.
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A system includes a display and a processor. The processor is configured to compute a point P' on a virtual surface of a point cloud representing an anatomical volume, by projecting another point P, which corresponds to a location on an anatomical surface of the anatomical volume, onto the virtual surface. The processor is further configured to define a virtual sphere centered on a virtual line joining P to P' such that P lies on a spherical surface of the virtual sphere, and to expand the point cloud throughout the virtual sphere or exclude the virtual sphere from the point cloud. The processor is further configured to regenerate the virtual surface such that, by virtue of having expanded the point cloud or excluded the virtual sphere, P lies on the virtual surface, and to display the regenerated virtual surface on the display. Other embodiments are also described.