Catheter Image Rendering Error Correction via Spline Interpolation
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Solution Overview
Problem
Conventional systems for visually rendering catheters in the body are prone to systematic measurement errors due to differences in sensor impedances and amplifier channels, leading to distorted images of the catheter's position and orientation.
Innovation Solution
An electronic control unit applies a spline function to correct measurement errors by determining display locations for position sensors and interpolating between them to generate accurate image data, thereby correcting systematic noise and improving image rendering accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional position sensing systems are used to track catheter sensors, then position and orientation information can be obtained, but systematic measurement errors occur due to differences in sensor impedances and amplifier channels causing distorted images
Solution Approach 1:
The system performs preliminary calibration by measuring the actual positions of sensors at known locations (such as at the tip and along the body of the catheter) before actual use. These measured positions are stored as reference data to correct systematic errors during image rendering, preventing distortion before it occurs.
Solution Approach 2:
The system changes the parameters used for position calculation by applying correction factors derived from calibration data. Instead of using raw sensor measurements directly, the system adjusts the position parameters based on the difference between measured and expected sensor positions during calibration, thereby compensating for systematic errors in impedance and amplifier channels.
2Productivity
If sensor positions are determined using voltage measurements from electrode pairs, then position information can be obtained, but systematic errors are introduced due to subtle differences in sensor impedances and amplifier channels
Solution Approach 1:
The system implements feedback by continuously comparing the measured sensor positions with the expected positions based on the catheter's known mechanical structure. The correction algorithm uses the calibration data to provide real-time feedback adjustments to the position calculations, compensating for systematic errors while maintaining continuous monitoring.
Solution Approach 2:
The system performs preliminary calibration to establish correction factors before continuous monitoring begins. This preliminary action captures the systematic errors in sensor impedances and amplifier channels, creating a reference framework that enables accurate continuous monitoring without being affected by these systematic errors.
3Ease of operation
If an image of the catheter is rendered based on determined sensor positions, then visual information about catheter location is provided, but the rendered shape is distorted from the true mechanical shape due to systematic errors
Solution Approach 1:
The system changes the rendering parameters by applying correction factors to the sensor position data before generating the visual image. The correction algorithm adjusts the coordinates used for rendering based on the calibration data, ensuring that the displayed catheter shape accurately reflects the true mechanical shape while maintaining ease of visual monitoring.
Solution Approach 2:
The system creates a corrected copy of the sensor position data that accurately represents the true catheter shape. Instead of rendering directly from potentially erroneous raw measurements, the system generates a corrected positional dataset that serves as an accurate visual representation, separating the visual copying function from the raw measurement data.
Data Source
AI summary
A system for visually rendering an elongate medical device in a body is provided. The system includes an electronic control unit configured to find a measured physical location for each of a plurality of position sensors on the elongate medical device. The electronic control unit is further configured to apply a spline function to each of the measured physical locations to determine a display location for each position sensor. The electronic control unit is further configured to interpolate between display locations of adjacent position sensors to identify display locations for portions of the elongate medical device between adjacent position sensors. The electronic control unit is further configured to generate image data for display of an image of the elongate medical device including the display locations of the position sensors and the display locations of the portions of the elongate medical device between adjacent position sensors.