Cone-Beam CT Scattering Mapping with Barrier Array Plates
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Solution Overview
Problem
The accuracy of determining photon scattering in cone-beam CT imaging needs improvement, which affects the quality and accuracy of three-dimensional reconstructed images due to decreased contrast and inaccurate CT values.
Innovation Solution
An image acquisition method involving a barrier array plate with barrier posts to occlude rays, allowing for the determination of scattered sampling points and interpolated sampling points, and the creation of a scattering distribution map to characterize the scattering of the imaging beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cone-beam CT imaging is used without scattering correction, then the imaging process is simple and fast, but the accuracy of three-dimensional reconstructed images deteriorates due to decreased contrast and inaccurate CT values
Solution Approach 1:
The patent segments the projection image into multiple regions based on barrier posts, identifying shaded areas where scattered photons are concentrated. By dividing the image into distinct regions (shaded and non-shaded areas) and processing each separately, the method enables accurate scattering determination without requiring complex full-image analysis, thus improving measurement precision while controlling device complexity
Solution Approach 2:
The patent introduces barrier posts as intermediary objects that occlude primary photons and create shaded areas. These barrier posts act as mediators to separate scattered photons from primary photons, allowing the scattering distribution to be determined through the shaded areas. This intermediary approach enables accurate scattering measurement without complex direct measurement systems
2Measurement precision
If scattering determination is performed using only shaded area sampling points, then the method is simple, but interpolation errors increase in non-shaded areas affecting image quality
Solution Approach 1:
The patent extends the scattering determination from one-dimensional shaded area sampling to two-dimensional scattering distribution mapping. By interpolating scattered sampling points from shaded areas to non-shaded areas and generating a comprehensive scattering distribution map, the method recovers scattering information across the entire projection image, reducing interpolation errors and preventing information loss in non-shaded regions
3Measurement precision
If barrier posts are used to occlude rays and create shaded areas, then scattered sampling points can be obtained, but the device structure becomes more complex
Solution Approach 1:
The patent applies local quality by placing barrier posts only in specific locations where they are most effective for creating shaded areas for scattering measurement. The barrier posts are strategically positioned to optimize shaded area coverage while minimizing overall structural complexity. This localized approach enables accurate scattering determination without requiring a completely complex barrier array structure
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 the accuracy of determining photon scattering, leading to more accurate three-dimensional image reconstruction by reducing interpolation errors and artifacts.
Implementation Method 1
a barrier array plate with barrier posts to occlude rays
Implementation Method 2
The scattering of X-ray photons during the cone beam CT imaging process affects the quality of the reconstructed image
Data Source
AI summary
Provided are an image acquisition method, an imaging system, calibration equipment and a storage medium. The image acquisition method includes: acquiring a projection image formed by an imaging beam passing through a barrier array plate; acquiring scattered sampling points corresponding to the barrier posts in the projection image; interpolating a vacancy between every adjacent scattered sampling points to obtain interpolated sampling points; and acquiring a scattering distribution map corresponding to the projection image based on the scattered signals of the scattered sampling points and of the interpolated sampling points.