Photon Count Detector for Phase Contrast X-ray Imaging
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Solution Overview
Problem
Current X-ray imaging technologies, particularly phase-contrast imaging, face challenges such as low photon utilization, mechanical instability, limited applicability to large samples, and high costs associated with synchronous radiation sources, which hinder effective diagnosis of early-stage breast tumors and other weak absorption materials.
Innovation Solution
A photon count-based radiation imaging system comprising an X-ray source, collimator, photon count detector, deflection mechanism, and timing position controller, which adjusts X-ray beam directions and activates specific detector partitions to collect and record data efficiently, reducing radiation exposure and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional absorption-contrast imaging is used, then the imaging system is simple and cost-effective, but it cannot detect early-stage breast tumors composed of light elements
Solution Approach 1:
The imaging process is segmented into multiple measurements (different projection angles, different energy levels) rather than attempting to capture all information in a single measurement. This allows the system to extract phase contrast information through computational processing of multiple simpler measurements, achieving high detection precision without requiring complex phase-contrast hardware
Solution Approach 2:
The patent introduces an intermediary computational processing step that transforms standard absorption measurements into phase contrast information. By using iterative reconstruction algorithms and dual-energy decomposition, the system recovers phase information from conventional transmission measurements, avoiding the need for complex phase-contrast imaging hardware
2Measurement precision
If crystal interference contrast-imaging method is used, then phase information can be obtained, but photon utilization is low and strong light source or longer exposure time is required
Solution Approach 1:
The patent employs continuous rotation of the sample or detector to collect projection data from multiple angles, ensuring that every photon detected contributes usefully to the final reconstruction. This continuous data acquisition approach maximizes photon utilization by eliminating idle measurement time and ensuring all detected photons provide information for image formation
Solution Approach 2:
The system changes measurement parameters (projection angle, energy level) systematically to extract phase information from standard absorption measurements. By varying these parameters and using iterative reconstruction, the system recovers phase contrast information without requiring the extreme photon fluxes needed by crystal interferometry
3Adaptability or versatility
If grating shearing method is used, then no synchrotron radiation is required, but the device complexity increases with multiple gratings and precise alignment requirements
Solution Approach 1:
The patent extracts the essential function of phase contrast imaging (obtaining phase information) from the complex grating system by using computational methods on standard transmission data. This separates the phase information extraction function from the hardware complexity, achieving adaptability without the mechanical complexity of multiple gratings and alignment mechanisms
4Measurement precision
If phase-contrast imaging is used to detect weak absorption materials, then detection sensitivity is improved, but radiation exposure time or dose increases
Solution Approach 1:
The patent uses partial information from multiple measurements to reconstruct phase contrast images, rather than requiring complete data from complex phase-contrast setups. By using iterative reconstruction and dual-energy decomposition on standard transmission data, the system achieves high detection sensitivity with exposure times and doses comparable to conventional imaging
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 system reduces radiation dosage, enables faster data collection for 3D reconstruction, minimizes equipment costs, and improves image quality by suppressing scattered rays, thus addressing the limitations of existing technologies.
Implementation Method 1
a deflection mechanism and an electron-beam reduction target... the electron-beam reduction target causes the electron beam to slow down suddenly and generate X-rays
Implementation Method 2
an X-ray collimator used for restricting and adjusting widths and directions of X-ray beams
Implementation Method 3
a photon count detector used for collecting ray signals produced when the X-rays penetrate an object
Data Source
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AI summary
A photon count-based radiation imaging system. The invention also relates to a method of implementing X-ray imaging in said system, and to key apparatus of said system. In the system, an x-ray source directs x-rays at a sample on a scanning platform. When the x-rays pass through said sample, photons carrying information about characteristics of the material at various spatial positions are produced. A photon count detector counts the photons on an imaging plane, obtains incident photon projection data and energy data, and transmits same to a 3D reconstruction system. The 3D reconstruction system reconstructs, on the basis of said projection data and energy data, the 3D structure and the matter composition inside the sample, then performs digital dyeing on the component parts of the sample, thereby differentiating the matter composition of the sample.