Intrabody Probe Shape Reconstruction Using Crossing Electromagnetic Fields
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Solution Overview
Problem
Current methods for navigating and reconstructing body cavities using intrabody probes face challenges in accurately reconstructing shapes without external references, orientation, or prior information, and struggle to efficiently transform electromagnetic field measurements into geometric positions.
Innovation Solution
A method and apparatus that utilize intrabody measurements of crossing electromagnetic fields to reconstruct body cavity shapes by generating a transformation that transforms measurement samples into geometric positions, using fewer than half of the measurements to enhance spatial uniformity, without relying on external references or orientations, and constrained by local spatial and coherence constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all measurement samples are transformed into geometric positions, then the completeness of the 3D model is improved, but the computational complexity and processing time increase
Solution Approach 1:
The patent applies partial action by transforming only a selected subset of measurement samples into geometric positions rather than all samples. The system identifies and transforms key samples that provide sufficient spatial information for accurate reconstruction, reducing computational load while maintaining model completeness. This is achieved through intelligent sampling strategies that select measurements optimally distributed in space.
2Measurement precision
If external references and prior information are used for reconstruction, then the accuracy of geometric positioning is improved, but the invasiveness and complexity of the procedure increases
Solution Approach 1:
The system applies self-service by performing self-calibration and self-positioning using only intrabody measurements from the electromagnetic field sensors. The reconstruction algorithm automatically establishes geometric positions and spatial relationships without requiring external reference frames, fiducial markers, or pre-acquired anatomical images. The method derives all necessary spatial information from the electromagnetic field measurements themselves, making the system self-sufficient and eliminating complex external reference systems.
3Measurement precision
If a large number of measurements are used for transformation, then the accuracy of the reconstructed shape is improved, but the spatial uniformity of measurement distribution deteriorates
Solution Approach 1:
The patent applies local quality by adapting the measurement sampling strategy to the local spatial characteristics of the body cavity. The system identifies regions with sparse measurement coverage and prioritizes transformation of samples from these regions, while reducing the number of transformations in densely sampled areas. This creates a uniform spatial distribution of transformed geometric positions, ensuring accurate reconstruction throughout the entire volume without over-concentration in specific regions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate and efficient reconstruction of body cavity shapes from intrabody probe measurements, providing a detailed 3D model of the body cavity without the need for external references, improving spatial uniformity and reducing reconstruction errors.
Implementation Method 1
receiving, by computer circuitry, measurements of the crossing electromagnetic fields carried out using at least one sensor carried on an intrabody probe
Data Source
AI summary
A method of reconstructing a shape of a volume of a part of a subject based on intrabody measurements of a plurality of crossing electromagnetic fields established within the volume, the method including:receiving, by computer circuitry, measurements of the crossing electromagnetic fields carried out using at least one sensor carried on an intrabody probe, the measuring being carried out with the probe at multiple locations in the volume, to provide a set of measurement samples, each taken at a location;generating, by computer circuitry and based on said measurement samples, a transformation that transforms measurement samples to geometric positions;transforming, using said generated transformation fewer than half of the measurements in said set of measurement samples into a set of geometric positions; andreconstructing the shape of said volume from said set of geometric positions.