Lumen-Centered Calcium Arc Computation for Intravascular Imaging
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Solution Overview
Problem
Current imaging techniques, such as OCT and IVUS, face challenges in accurately computing lumen-centered calcium arcs and displaying them consistently due to variations in device position and field-of-view, leading to erratic and distorted representations of plaque regions.
Innovation Solution
A system that computes lumen-centered arcs by identifying the lumen-center and converting image data from device-centered to lumen-centered coordinates, using machine learning models and low-pass smoothing filters to stabilize the lumen-center across image frames, allowing for consistent display and accurate calcium scoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If device-centered arcs are used to represent plaque regions, then the representation is simple to compute, but the display varies erratically from frame-to-frame due to device position variations
Solution Approach 1:
The patent introduces lumen-center as an intermediary reference point between the device-centered coordinate system and the anatomically meaningful lumen-centered coordinate system. By computing the lumen-center from image data and using it as the origin for arc representation, the system mediates between the simple device-centered computation and the stable lumen-centered display, eliminating erratic variations while maintaining computational feasibility.
2Ease of manufacture
If device-centered arcs are used, then the computation is straightforward, but the arcs appear larger or smaller than the actual plaque region depending on field-of-view settings
Solution Approach 1:
The patent changes the reference parameter from device-center to lumen-center. By computing the lumen-center position from the image data and using it as the origin for arc calculation, the system adjusts the coordinate system parameter to ensure that the arc always accurately represents the actual plaque region size and position, independent of field-of-view settings or device position variations.
3Measurement precision
If lumen-centered arcs are computed, then the display consistency and accuracy are improved, but the computational complexity increases
Solution Approach 1:
The patent performs preliminary computation of the lumen-center position from the image data before calculating the lumen-centered arcs. By pre-computing the lumen-center as an intermediate step, the system prepares the accurate reference point needed for precise arc representation, enabling improved measurement precision while organizing the computational process efficiently to manage complexity.
Data Source
AI summary
Methods, systems, and apparatus, including computer-readable storage media for calculating lumen-centered calcium arcs. A method includes receiving, by one or more processors, an image frame and an identification of a region of plaque in the image frame. The image frame is taken while the imaging device is in a lumen depicted in the image frame. The one or more processors identify a lumen-center of the lumen in the image frame, and generate a lumen-centered are having a coverage angle centered on the lumen-center, using at least the lumen-center.