Compton Tomography System Using Sheet Beam for One-Sided Scanning
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Solution Overview
Problem
Conventional x-ray computed tomography systems face challenges in scanning large or stationary objects due to the need for a large gantry and high-cost, large-area detectors, and they produce low-contrast images in low-Z materials, while Compton tomography methods are slow and require two-sided access.
Innovation Solution
A Compton x-ray tomography system that uses a sheet-like x-ray beam and apodized aperture optics for one-sided scanning of large objects, allowing for efficient 3D structure acquisition with compact hardware, by irradiating 2D planar cross-sections and translating the object or source-camera assembly for data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional x-ray CT systems use a diverging beam and large-area detectors to scan objects in multiple directions, then 3D object structure acquisition is achieved, but the system requires a large gantry and becomes nearly impossible to scan large or stationary objects
Solution Approach 1:
The patent extracts only the essential measurement function from the conventional CT system by using a collimated pencil beam instead of a diverging beam, eliminating the need for a large gantry and complex rotation mechanisms while still achieving 3D reconstruction through Compton scattering measurements
Solution Approach 2:
The patent replaces the mechanical rotation system with a computational approach, using a single fixed detector position to collect Compton scattering data from multiple angles by translating the object or beam, thereby eliminating the need for a large gantry and complex mechanical structures
2Measurement precision
If conventional x-ray CT systems use a diverging x-ray beam, then 3D object structure acquisition is achieved, but large-area detectors are required which increases system complexity and cost
Solution Approach 1:
The patent extracts only the necessary detection function by using a collimated pencil beam that defines a precise measurement path, allowing the use of a small-area detector positioned at a fixed location while still gathering sufficient data for 3D reconstruction
Solution Approach 2:
The patent changes the beam geometry parameter from a diverging beam to a collimated pencil beam, which fundamentally alters the detector requirements from large-area to small-area, enabling fixed-position detection while maintaining measurement capability
3Measurement precision
If conventional x-ray CT systems are used for imaging, then 3D structure is acquired, but high-contrast images are not produced in low-Z materials which have relatively small x-ray absorption
Solution Approach 1:
The patent converts the previously unused Compton scattering effect, which was considered a source of noise in conventional CT, into the primary measurement signal. This provides enhanced contrast for low-Z materials because Compton scattering is proportional to electron density, which varies more significantly in organic materials than x-ray absorption
4Ease of operation
If Compton tomography uses a thin and collimated beam with point-by-point scanning, then one-sided inspection of large objects is achieved, but the acquisition process becomes slow
Solution Approach 1:
The patent adds a temporal dimension to the data collection process by continuously translating the object or beam through the measurement volume while the detector collects data along the entire path, transforming a slow point-by-point process into a rapid volumetric scan that maintains one-sided inspection capability
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
Enables quick and efficient 3D object structure acquisition with high-contrast imaging in both low-Z and high-Z materials, suitable for non-destructive testing and medical imaging, and provides improved signal strength and penetration depth without the need for extensive setup or equipment.
Implementation Method 1
Compton tomography system uses a sheet-like x-ray beam and records 2D images of Compton-scattered x-rays
Data Source
AI summary
A Compton tomography system comprises an x-ray source configured to produce a planar x-ray beam. The beam irradiates a slice of an object to be imaged, producing Compton-scattered x-rays. The Compton-scattered x-rays are imaged by an x-ray camera. Translation of the object with respect to the source and camera or vice versa allows three-dimensional object imaging.