Fiducial Marker Tracking for Out-of-Plane Catheter Deviation
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Solution Overview
Problem
X-ray imaging provides projection images with poor representation of depth information, making it challenging to interpret and visualize the orientation of elongate interventional devices accurately.
Innovation Solution
A computer-implemented method using fiducial markers along the elongate interventional device to identify out-of-plane deviations by analyzing distances between markers in X-ray images, adjusting the imaging pose to align deviating segments with the image plane, and computing a three-dimensional shape based on subsequent imaging data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If X-ray projection imaging is used to visualize elongate interventional devices, then the imaging process is simple and快速获取, but the depth information representation is poor and interpretation is challenging
Solution Approach 1:
The patent transforms 2D X-ray projection images into 3D spatial information by detecting fiducial markers at multiple positions along the interventional device. By analyzing the relative positions and distances between markers in projection images, the system reconstructs three-dimensional device geometry and orientation, adding depth perception to the otherwise flat projection data.
Solution Approach 2:
Fiducial markers serve as intermediary objects that bridge the gap between the interventional device and the X-ray imaging system. These markers are attached to the device and provide detectable reference points that enable the system to infer device position, orientation, and shape from 2D projection images without requiring complex direct imaging of the device itself.
2Loss of information
If multiple X-ray images are taken from different angles to improve depth representation, then the three-dimensional information is enhanced, but the imaging time and complexity increase
Solution Approach 1:
Fiducial markers are pre-attached to the interventional device before the procedure. This preliminary placement of reference points enables rapid 3D localization throughout the procedure without requiring repeated marker placement or complex setup for each imaging angle, saving time during actual imaging.
Solution Approach 2:
The system continuously tracks the positions of fiducial markers across multiple X-ray images, maintaining constant 3D reconstruction capability. By processing a sequence of images with consistent marker detection, the system provides continuous spatial information without requiring interruption for repositioning or recalibration, thereby reducing total imaging time.
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
Improves visualization of elongate interventional devices by aligning out-of-plane deviations with the image plane and estimating a three-dimensional shape, enhancing the accuracy of medical procedures like catheterization.
Implementation Method 1
X-ray imaging data representing one or more X-ray images of the elongate interventional device including the plurality of fiducial markers
Data Source
AI summary
A computer-implemented method of identifying an out-of-plane deviation of an elongate interventional device (110). The method includes identifying (SI 30) in the one or more X-ray images (180), and based on a distance (1901 . . . n-1) between one or more pairs of the fiducial markers (1601 . . . n) detected in the one or more X-ray images (180), a position of one or more segments (1701 . . . n-1) of the elongate interventional device (110) having an out-of-plane deviation respective the image plane (120).