Lung Region Mapping Image Control for VAL-MAP Dye Simulation
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Solution Overview
Problem
During Virtual Assisted Lung Mapping (VAL-MAP), the accuracy of simulating dye seepage positions on the lung surface is compromised due to low extraction accuracy of bronchial paths, leading to unnatural extensions and incorrect prediction of stainable areas.
Innovation Solution
A mapping image display control device and method that extracts lung and bronchus regions, estimates reaching position information based on branching positions, and generates a mapping image to accurately simulate dye seepage positions, using techniques such as straight line estimation, spline interpolation, and centroid linking to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bronchial path extraction is performed using image processing, then the bronchus region can be identified, but the extraction accuracy is low causing the bronchial path to be incorrectly recognized
Solution Approach 1:
The patent introduces branching position information as an intermediary element to bridge the gap between extracted bronchial paths and lung surface mapping. By using branching positions (identified through image processing) as reference points to guide the extension of bronchial paths to the lung surface, the system compensates for extraction inaccuracies. The branching positions serve as reliable anchor points that maintain mapping accuracy even when the overall bronchial path extraction is imperfect.
2Manufacturing precision
If the bronchial path is extended to the lung surface using graph structure, then the reaching position can be determined, but the extended line bends in an unnatural direction when extraction accuracy is low
Solution Approach 1:
The patent changes the parameter used for extension from the extracted bronchial path geometry to branching position information. Instead of relying on the potentially inaccurate shape of the extracted bronchial path, the system uses branching positions as fixed reference points and extends lines to the lung surface based on these parameters, ensuring more natural and accurate reaching positions.
3Measurement precision
If the extended line direction is determined from the extracted bronchial path, then the reaching position can be calculated, but the direction becomes unnatural and differs from the actual extending direction
Solution Approach 1:
The patent performs preliminary identification of branching positions before extending the bronchial paths to the lung surface. By first locating the branching positions (which are more reliably identifiable) and then using them as starting points for extension, the system preserves the actual extending direction information. This preliminary action ensures that the extension process begins from accurate reference points, maintaining the natural direction of bronchial path extension.
Data Source
AI summary
A mapping image display control device includes a lung region extraction unit 11 that extracts a lung region included in a three-dimensional image, a bronchus region extraction unit 12 that extracts a bronchus region included in the lung region, a branching position information acquisition unit 13 that acquires information about a branching position of the bronchus region, a reaching position information estimation unit 14 that estimates reaching position information about a position at which an extended line of a branch included in the bronchus region reaches a surface of the lung region on the basis of the information about the branching position, and a display control unit 15 that generates a mapping image in which the reaching position information is mapped to the surface of the lung region and that causes a display apparatus 3 to display the mapping image.