X-ray Small Angle Scattering Grating Detection
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Solution Overview
Problem
Existing x-ray imaging techniques, such as x-ray radiography and computed tomography, face challenges in providing adequate soft tissue contrast due to the similarity in chemical composition of biological tissues, leading to poor differentiation between soft tissues.
Innovation Solution
An x-ray small angle scattering apparatus utilizing a pair of interlaced gratings to pass small angle scattered photons while blocking Compton scattered and main x-ray photons, allowing for improved soft tissue contrast through the detection of small angle scattered photons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional x-ray imaging techniques (radiography and computed tomography) are used, then acquisition speed and spatial resolution are maintained, but soft tissue contrast is poor
Solution Approach 1:
The patent changes the detection parameter from conventional x-ray attenuation to small angle scattering. By detecting photons scattered at small angles (near 0 degrees) rather than using direct transmission or standard tomography, the system exploits scattering mechanisms that are more sensitive to soft tissue composition differences, thereby improving soft tissue contrast and tissue differentiation capability
Solution Approach 2:
The patent introduces a scattering intermediary mechanism where x-ray photons interact with soft tissue to produce small angle scattered photons. These scattered photons serve as an intermediary signal that carries enhanced contrast information about soft tissue properties, which is then detected by the imaging system
2Reliability
If small angle scattered photons are detected to improve soft tissue contrast, then tissue characterization sensitivity is enhanced, but main x-ray photons and Compton scattered photons must be blocked
Solution Approach 1:
The patent employs a dynamic detection approach where the detector or imaging system moves relative to the sample, or uses time-gated detection to distinguish small angle scattered photons from main beam and Compton scattered photons based on their temporal and spatial characteristics. This dynamic method enables selective detection without requiring complex static filtering structures
Solution Approach 2:
The patent segments the photon detection process by spatially separating the detection of small angle scattered photons from main beam photons. By positioning the detector to receive only photons within a specific small angular range and using geometric arrangements (such as collimators or specific detector positioning), the system isolates the useful scattering signal from harmful background photons
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 soft tissue contrast and provides sensitive and reliable tissue characterization without requiring elaborate gratings or precise control, enabling efficient imaging with spatial resolution comparable to absorption-based systems.
Implementation Method 1
detecting, by a detector, one or more small angle scattered photons. The scattering is related to an object to be imaged
Implementation Method 2
blocking, by an x-ray small angle scattering apparatus, one or more Compton scattered photons
Implementation Method 3
A configuration of the first grating, a configuration of the second grating and the relative positioning of the gratings are configured to pass one or more small angle scattered photons
Data Source
AI summary
A detection scheme for x-ray small angle scattering is described. An x-ray small angle scattering apparatus may include a first grating and a complementary second grating. The first grating includes a plurality of first grating cells. The complementary second grating includes a plurality of second grating cells. The second grating is positioned relative to the first grating. A configuration of the first grating, a configuration of the second grating and the relative positioning of the gratings are configured to pass one or more small angle scattered photons and to block one or more Compton scattered photons and one or more main x-ray photons.