3D X-Ray Stent Reconstruction via Axis-Aligned Coordinate Transformation
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Solution Overview
Problem
Current three-dimensional image processing methods for X-ray diagnostics, such as displaying stents, make it difficult for doctors to observe objects of interest like stents due to oblique rotations and elliptical cross-sections, requiring time-consuming manual adjustments during interventions.
Innovation Solution
A three-dimensional image processing apparatus that acquires three-dimensional coordinates of an object's axis from feature information across multiple X-ray images, sets a coordinates system with the object's axis as a reference, and reconstructs image data for easier observation, including features like automatic rotation and circular cross-sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If image is generated in table top coordinates system with cephalocaudal axis as reference, then standard coordinate system is maintained, but object of interest (stent) is displayed obliquely and rotates obliquely making it hard to observe
Solution Approach 1:
The patent transforms the coordinate system from the standard table top coordinates system to a new coordinate system where the z-axis aligns with the longitudinal axis of the stent. This dimensional transformation allows the stent to be displayed in its true circular cross-section rather than an oblique elliptical shape, enabling doctors to observe the stent structure clearly without oblique rotation.
2Adaptability or versatility
If manual rotation axis adjustment is performed, then observation angle can be changed, but it takes time during intervention operation
Solution Approach 1:
The system automatically determines the stent's longitudinal axis by detecting feature points (such as radio-opaque markers) in the X-ray images and computes the axis direction without requiring manual intervention. The coordinate transformation is performed automatically, eliminating the time-consuming manual rotation axis adjustment process while maintaining the ability to adapt to different stent orientations.
3Measurement precision
If cross section is displayed in elliptical shape, then projection from angled views is accurate, but it is hard to check for cracked places and expansion
Solution Approach 1:
The patent changes the coordinate system parameters so that the cross-sectional plane is perpendicular to the stent's longitudinal axis rather than parallel to the table top. This parameter change transforms the elliptical cross-section into a circular shape in the displayed image, allowing doctors to accurately measure the stent diameter and detect cracks or expansion issues without the distortion caused by oblique projections.
Data Source
AI summary
Data of a plurality of projected images, which is photographed from different directions, regarding an object of interest is stored in an image data storage section. A feature point coordinates acquisition section acquires the three-dimensional coordinates regarding the axis of the object of interest on the basis of the feature information and photographing directions regarding the axis of the object of interest on at least two of the plurality of projected images stored in the image data storage section. A coordinates transformation section sets the three-dimensional coordinates system, which has the axis of the object of interest as one axis, on the basis of the three-dimensional coordinates information. A reconstruction processing section reconstructs three-dimensional image data based on the set three-dimensional coordinates system from the plurality of projected images stored in the image data storage section.