Backscattered X-Ray Imaging With Multiple Sources for Uniform Flux
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Solution Overview
Problem
Existing x-ray imaging systems using backscattered photons face challenges in image formation due to low refractive index and transparency of metals, leading to non-uniform photon distribution and low signal-to-noise ratio, particularly in situations where objects cannot be placed between the source and detector, such as with luggage inspection or opaque substances.
Innovation Solution
An imaging device employing a plurality of distinct x-ray sources and a pixelated detector with an absorbing plate or collimator to uniformly irradiate and collect backscattered photons, improving spatial resolution and signal-to-noise ratio by compensating for non-uniformities in photon distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single x-ray source is used to irradiate the object, then the device complexity is reduced, but the photon distribution becomes non-uniform and the signal-to-noise ratio deteriorates
Solution Approach 1:
The imaging system divides the irradiation function into multiple independent x-ray sources arranged around the object. Each source contributes to illuminating a specific region, and the signals are combined to form the complete image. This segmentation allows uniform photon distribution across the entire object surface, improving the signal-to-noise ratio while maintaining manageable device complexity through modular source configuration.
Solution Approach 2:
Multiple x-ray sources are combined to work simultaneously or sequentially, merging their photon fluxes to create uniform illumination across the object. The detector integrates signals from all sources, combining their contributions to achieve sufficient signal intensity and improved signal-to-noise ratio that would be impossible with a single source.
2Measurement precision
If the hole diameter in the absorbing plate is increased to improve the signal-to-noise ratio, then the signal-to-noise ratio improves, but the spatial resolution degrades
Solution Approach 1:
The absorbing plate is divided into multiple regions with corresponding detector pixels, creating a pixelated detection array. Each pixel collects photons through its associated hole, and the segmented detection structure allows optimization of hole size for each pixel region. This segmentation enables sufficient hole diameter for signal accumulation while maintaining spatial resolution through the pixelated architecture.
Solution Approach 2:
The system optimizes the hole diameter and detector pixel characteristics locally for each region. By tailoring the hole size to match the detector pixel dimensions and the required signal levels in different regions, the system achieves optimal balance between signal-to-noise ratio and spatial resolution across the entire detection area.
3Manufacturing precision
If the hole diameter is decreased to improve the spatial resolution, then the spatial resolution improves, but the signal-to-noise ratio deteriorates
Solution Approach 1:
Multiple x-ray sources are merged to provide sufficient total photon flux through the small holes. The combined signal from multiple sources ensures that even with small hole diameters for high spatial resolution, the signal-to-noise ratio remains adequate for image quality requirements.
Solution Approach 2:
The system employs continuous or repeated irradiation by multiple sources to accumulate sufficient signal photons. By maintaining continuous useful action through multiple sources, the system compensates for the reduced photon flux through small holes, ensuring adequate signal-to-noise ratio while preserving spatial resolution.
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
Enhances image quality by uniformly distributing incident photons and compensating for geometric non-uniformities, resulting in improved spatial resolution and signal-to-noise ratio in backscattered x-ray imaging.
Implementation Method 1
Among the identified physical effects, Rayleigh and Compton scattering are principally of note
Implementation Method 2
Among the identified physical effects, Rayleigh and Compton scattering are principally of note
Implementation Method 3
an absorbing plate pierced with at least one orifice allowing x-ray photons potentially scattered by the object to pass through the orifice
Data Source
AI summary
An imaging device employing backscattered x-ray photons, includes a plurality of x-ray sources, all configured to irradiate an analysis region wherein an object to be imaged may be placed, and a pixelated x-ray detector placed so as to detect x-ray photons potentially scattered by the object.