3D Backscatter Imaging System Using Segmented Detector
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Solution Overview
Problem
Current imaging technologies, such as backscatter radiography, face challenges in generating high-resolution images of internal structures without direct access, particularly in distinguishing between single-scatter and multiple-scatter photons, which limits the accuracy of subsurface feature detection.
Innovation Solution
The development of an imaging system that uses a movable radiation source and detector, capable of independent rotational movement, to collect multiple images from various angles, allowing for the isolation of backscattered radiation components and subsequent three-dimensional reconstruction of objects using a collimator grid to focus radiation along specific lines of sight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If backscatter radiography is used to image internal structures without direct access, then imaging capability is achieved, but resolution and accuracy of subsurface feature detection deteriorate due to inability to distinguish single-scatter and multiple-scatter photons
Solution Approach 1:
The detector is divided into multiple detector segments, each associated with a specific collimator element. This segmentation allows different regions of the detector to capture different scatter photon components (single-scatter and multiple-scatter photons) from different angular ranges, enabling differentiation and improved subsurface feature detection accuracy.
Solution Approach 2:
Different detector segments are assigned different functions based on their angular positioning relative to the radiation source. Some segments primarily detect single-scatter photons while others detect multiple-scatter photons, allowing each segment to be optimized for specific scatter components and improving overall measurement precision.
2Measurement precision
If a collimator grid is used to focus radiation along specific lines of sight, then line of sight isolation is improved, but device complexity increases
Solution Approach 1:
The collimator grid is segmented into multiple collimator elements, each corresponding to a specific detector segment. This segmentation creates distinct lines of sight for each element-segment pair, improving line of sight isolation while managing complexity through modular design where each segment handles a specific angular range.
3Measurement precision
If multiple detector segments are used to isolate backscattered radiation components, then subsurface resolution is enhanced, but device complexity increases
Solution Approach 1:
The detector is divided into multiple detector segments, each associated with a specific collimator element. This segmentation allows different regions of the detector to capture different scatter photon components (single-scatter and multiple-scatter photons) from different angular ranges, enabling differentiation and improved subsurface feature detection accuracy.
Solution Approach 2:
The segmented detector system serves multiple functions: it detects both single-scatter and multiple-scatter photons, enables angular differentiation, and provides the capability for three-dimensional reconstruction. This multi-functionality justifies the increased complexity by delivering comprehensive imaging capabilities.
4Adaptability or versatility
If radiation source and detector are made movable for multi-angle imaging, then three-dimensional reconstruction capability is achieved, but device complexity and operational complexity increase
Solution Approach 1:
The radiation source and detector are combined into a single movable assembly that rotates together as one unit about the object. This merging reduces the number of independent movement mechanisms required, as both components move in unison to maintain their relative geometric relationship while achieving multi-angle imaging for three-dimensional reconstruction.
Solution Approach 2:
The system transitions from a static single-sided imaging configuration to a dynamic multi-angle imaging system. The radiation source and detector assembly can rotate about the object to capture images from multiple angles, enabling three-dimensional reconstruction and providing adaptability for different imaging requirements.
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 enables non-destructive, single-sided imaging of objects, enhancing subsurface resolution and allowing for the detection of hidden features or defects, applicable in various industries including medical, military, and security, by processing data from multiple orientations to generate detailed three-dimensional images.
Implementation Method 1
One method of backscatter imaging is Compton Backscatter Imaging (CBI), which is based on Compton scattering.
Implementation Method 2
The detector (or detectors) can be separated into multiple detector segments (i.e., using a collimator grid) so that each segment has a single line of sight projection through the object and so only detects radiation along that line of sight.
Implementation Method 3
The detector may comprise a photostimuable phosphorous-based image plate, TFT-based flat panel detector, an amorphous silicon panel, a digitizing field screen, or a combination thereof.
Data Source
AI summary
Systems and methods for imaging an object using backscattered radiation are described. The imaging system comprises both a radiation source for irradiating an object that is rotationally movable about the object, and a detector for detecting backscattered radiation from the object that can be disposed on substantially the same side of the object as the source and which can be rotationally movable about the object. The detector can be separated into multiple detector segments with each segment having a single line of sight projection through the object and so detects radiation along that line of sight. Thus, each detector segment can isolate the desired component of the backscattered radiation. By moving independently of each other about the object, the source and detector can collect multiple images of the object at different angles of rotation and generate a three dimensional reconstruction of the object. Other embodiments are described.