Medical Image Reconstruction Using Dual Filters for Stent Visualization
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Solution Overview
Problem
Current medical image processing technologies face challenges in clearly observing stents and vessels during coiling treatments due to the small diameter of metal materials in stents, making it difficult to evaluate the degree of adhesion and increasing exposure dose or contrast medium injection, especially when reconstructing X-ray images with high spatial resolution.
Innovation Solution
A medical image processing device that includes a first reconstruction unit generating a standard reconstructed image and a second reconstruction unit generating a high-frequency emphasis image, which are then combined to clearly depict both the stent and vessels without increasing the number of projection directions, using a combination of reconstruction filters such as Ramachandran and Shepp & Logan filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the X-ray collection image is reconstructed with high resolution, then the stent is clearly drawn up to a strut, but it is mixed with concave and convex portions of the surface of the vessel, making the boundary unclear
Solution Approach 1:
The patent divides the reconstruction process into two separate images: one optimized for stent visualization (high-frequency emphasis) and another for vessel visualization (standard reconstruction). This segmentation allows each image to be optimized for its specific purpose without the interference that occurs when both are combined in a single high-resolution reconstruction.
Solution Approach 2:
The patent applies different reconstruction qualities to different objects of interest. The stent region receives high-frequency emphasis reconstruction for detailed strut visualization, while the vessel region maintains standard reconstruction quality. This local differentiation of image quality allows clear visualization of the stent without the vessel surface irregularities that would otherwise obscure boundaries.
2Measurement precision
If the number of projection directions is increased to improve image quality, then the resolution is improved, but the exposure dose increases
Solution Approach 1:
The patent changes the reconstruction filter parameters rather than increasing the number of projection directions. By applying high-frequency emphasis filters to standard projection data, the patent achieves improved stent visualization without requiring additional projections, thereby avoiding increased exposure dose.
3Length of moving object
If the diameter of metal material in stent is very small, then the stent can be placed in the parent vessel, but it is very difficult to view the metal material on radiographic image
Solution Approach 1:
The patent applies high-frequency emphasis reconstruction filters that effectively amplify the high-frequency signals corresponding to the small-diameter metal stent struts. This filter-based approach enhances the visibility of fine metallic structures without requiring physical changes to the stent or additional imaging resources.
Data Source
AI summary
A medical image processing device according to an embodiment includes a first reconstruction unit, a second reconstruction unit, and an image combining unit. The first reconstruction unit generates a first reconstructed image on the basis of an X-ray collection image using a first reconstruction filter. The second reconstruction unit generates a second reconstructed image on the basis of the X-ray collection image, using a second reconstruction filter having a high-frequency emphasis effect more than that of the first reconstruction filter. The image combining unit combines the first reconstructed image with the second reconstructed image.