Dual-Filter Catheter Tracking for Latency and Map Accuracy
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Solution Overview
Problem
Current medical tracking systems face challenges in providing real-time, stable representation of catheter movement while generating accurate anatomical maps, as aggressive filtering for map generation introduces latency and non-aggressive filtering results in noisy maps with artifacts.
Innovation Solution
Implementing two filtering levels for position signals, with an aggressive filter for anatomical map generation and a non-aggressive filter for real-time catheter movement tracking, and using finite impulse response filters with peak preservation techniques to maintain signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If aggressive filtering is applied to position signals for anatomical map generation, then map accuracy is improved, but latency in catheter movement representation increases
Solution Approach 1:
The patent divides the single filtering operation into two separate filtering operations with different filtering levels. The first smoother applies a first filtering level to generate first filtered position signals for real-time catheter movement representation, while the second smoother applies a second filtering level to generate second filtered position signals for anatomical map generation. This segmentation allows each filtering operation to be optimized for its specific purpose without compromising the other.
2Speed
If non-aggressive filtering is applied to position signals for real-time tracking, then latency is reduced, but anatomical map quality deteriorates with noise and artifacts
Solution Approach 1:
The patent divides the single filtering operation into two separate filtering operations with different filtering levels. The first smoother applies a first filtering level to generate first filtered position signals for real-time catheter movement representation, while the second smoother applies a second filtering level to generate second filtered position signals for anatomical map generation. This segmentation allows each filtering operation to be optimized for its specific purpose without compromising the other.
3Measurement precision
If aggressive filtering is applied to position signals, then anatomical map accuracy is improved, but device complexity increases
Solution Approach 1:
The patent divides the single filtering operation into two separate filtering operations with different filtering levels. The first smoother applies a first filtering level to generate first filtered position signals for real-time catheter movement representation, while the second smoother applies a second filtering level to generate second filtered position signals for anatomical map generation. This segmentation allows each filtering operation to be optimized for its specific purpose without compromising the other.
Data Source
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AI summary
In one embodiment, a system includes a catheter, at least one position sensor to provide position signal(s) indicative of a position of a distal end of the catheter over time, a first smoothing filter to provide first filtered position signal(s) responsively to the position signal(s) and a first filtering level, a second smoothing filter to provide second filtered position signal(s) responsively to the position signal(s) and a second filtering level, wherein the second filtering level provides more smoothing than the first filtering level, and processing circuitry to find first and second position coordinates of the distal end responsively to the first and second filtered position signal(s), respectively, generate, and render to a display, an anatomical map of a body part responsively to the second position coordinates, and render a representation of the distal end to the display while showing movement of the distal end responsively to the first position coordinates.