3D Image Reconstruction Operator Scattered Radiation Correction
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Solution Overview
Problem
Existing methods for acquiring 3D image datasets in x-ray imaging struggle to accurately account for scattered radiation, leading to reconstruction artifacts and inefficiencies in the imaging process.
Innovation Solution
The method incorporates scattered radiation into the operator A describing projection image acquisition, using the operator AS=−ln [exp(−R(ƒ))+S(ƒ)], where R(ƒ) represents forward projection and S(ƒ) calculates the normalized intensity distribution of scattered radiation, allowing for improved reconstruction by adjusting the iteration formula φ(i+1)=φ(i)+λ(i)(g−ASƒ(i)) to account for scattered radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional reconstruction methods are used without scattered radiation correction, then the reconstruction process is simpler and faster, but the image accuracy deteriorates due to scattered radiation artifacts
Solution Approach 1:
The patent applies preliminary scattered radiation correction by calculating and storing correction factors before the main reconstruction process. The correction factors are pre-computed based on the object's attenuation properties and geometry, then applied during reconstruction to eliminate scattered radiation artifacts without adding complexity to the core reconstruction algorithm.
Solution Approach 2:
The patent introduces an intermediary correction operator that acts between the raw projection data and the reconstruction process. This operator separates the scattered radiation correction from the main reconstruction algorithm, allowing accurate correction while maintaining the simplicity and speed of the original reconstruction method.
2Measurement precision
If scattered radiation correction is applied using the operator AS=−ln [exp(−R(ƒ))+S(ƒ)], then the image fidelity improves, but the computational time increases due to additional calculations
Solution Approach 1:
The patent performs scattered radiation correction calculations in advance before the iterative reconstruction process begins. By pre-computing the correction terms based on the object model and geometry, the method eliminates the need for time-consuming scattered radiation calculations during each iteration, thus maintaining fast convergence while achieving high image fidelity.
Solution Approach 2:
The patent applies a simplified scattered radiation correction model that captures the dominant effects without computing all possible scattering paths. This partial correction approach achieves sufficient image fidelity for practical applications while keeping computational requirements manageable and convergence fast.
3Measurement precision
If the operator A is enhanced to include scattered radiation modeling, then the reconstruction accuracy improves, but the operator complexity increases
Solution Approach 1:
The patent segments the projection operator into distinct components: the primary radiation term R(ƒ) and the scattered radiation term S(ƒ)). This segmentation allows each component to be modeled and corrected independently, simplifying the overall operator structure while maintaining high reconstruction accuracy through targeted correction of scattered radiation effects.
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
This approach enhances the accuracy of 3D image reconstruction by minimizing the impact of scattered radiation, leading to faster convergence and improved image fidelity by directly addressing scattered radiation in the reconstruction process.
Implementation Method 1
the x-ray radiation source emits x-ray radiation, the x-ray radiation is attenuated by the image object, being attenuated to different degrees by different regions of the image object
Implementation Method 2
which are acquired with the aid of the x-ray radiation detector
Implementation Method 3
During imaging with x-ray radiation there is inevitably scattered radiation. Scattered radiation is radiation which does not penetrate the image object in a straight line
Data Source
AI summary
A method for acquiring a 3D image dataset for an image object based on a plurality of 2D image datasets relating to the image object is proposed. A scattered radiation is taken into account in an acquisition operator used in the method for the optimum reconstruction of the 3D image dataset. The acquisition operator should be as close as possible to the real mapping operator.