Grating-Based CT System for Soft Tissue Contrast
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Solution Overview
Problem
Current X-ray computed tomography (CT) imaging techniques face limitations in achieving high-resolution, accurate imaging of soft tissues due to poor contrast and inefficiencies, particularly in cancer detection and characterization, where existing methods are expensive, difficult to use, and slow in data acquisition.
Innovation Solution
The implementation of a system with two gratings or grating layers between the object and detector in X-ray CT imaging, which blocks primary X-rays while allowing scattered X-rays to reach the detector, enabling the generation of high-resolution dark field images, including small angle scattering images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional absorption contrast imaging is used, then the system is simple and cost-effective, but the soft tissue contrast is poor and imaging precision is insufficient
Solution Approach 1:
The patent segments the X-ray imaging process into multiple contrast mechanisms by introducing two gratings that enable simultaneous acquisition of absorption contrast and scattering contrast images. The first grating (G1) and second grating (G2) divide the detector signal into multiple components, allowing separate measurement of different physical effects (absorption and small-angle scattering) from the same X-ray beam passing through the object.
Solution Approach 2:
The imaging system achieves multi-functionality by using a single X-ray source and detector combination that can simultaneously provide multiple types of contrast information. The grating-based setup allows the same hardware to capture both absorption contrast (for bone and high-Z materials) and scattering contrast (for soft tissue microstructure), making the system versatile for different tissue types without requiring separate imaging systems.
2Measurement precision
If scattering imaging is implemented to improve soft tissue contrast, then imaging precision improves, but data acquisition time increases and productivity decreases
Solution Approach 1:
The patent merges the acquisition of absorption contrast and scattering contrast into a single simultaneous measurement process. By using two gratings positioned before the detector, both types of contrast information are captured in the same exposure time, eliminating the need for sequential scanning or multiple separate measurements. This combining approach maintains high productivity while achieving improved soft tissue contrast through scattering signal detection.
3Measurement precision
If high-resolution imaging is pursued, then measurement precision improves, but the system becomes more expensive and complex
Solution Approach 1:
The two gratings act as intermediary elements that enable high-resolution scattering contrast imaging using a standard detector. Rather than requiring specialized high-resolution detectors or complex interferometric setups, the gratings G1 and G2 mediate the X-ray beam to create spatial modulation patterns that encode scattering information, which can then be decoded using relatively simple image processing algorithms.
4Adaptability or versatility
If multiple imaging modes are implemented, then adaptability improves, but device complexity and cost increase
Solution Approach 1:
The imaging system achieves multi-functionality by using a single X-ray source and detector combination that can simultaneously provide multiple types of contrast information. The grating-based setup allows the same hardware to capture both absorption contrast (for bone and high-Z materials) and scattering contrast (for soft tissue microstructure), making the system versatile for different tissue types without requiring separate imaging systems.
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 results in efficient, cost-effective, and fast data acquisition of high-resolution dark field images, enhancing cancer tissue identification and characterization, and can be scaled for in vivo imaging, providing valuable information on tumor characteristics and structures.
Implementation Method 1
The first grating layer and the second grating layer can be disposed such that, during imaging, non-scattered radiation is blocked from reaching the detector
Implementation Method 2
scattered X-rays (e.g., small angle scattering X-rays) that are deflected as they pass through the object to be imaged reach the detector
Data Source
AI summary
Systems and methods for obtaining scattering images during computed tomography (CT) imaging are provided. Two gratings or grating layers can be disposed between the object to be imaged and the detector, and the gratings or grating layers can be arranged such that primary X-rays are blocked while scattered X-rays that are deflected as they pass through the object to be imaged reach the detector to generate the scattering image.