Spatial Sequenced Backscatter Portal Cross-Talk Reduction
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Solution Overview
Problem
Compton backscatter imaging systems face cross-talk issues when multiple beams are used concurrently, leading to noise and inefficiency in constructing 3-D images of objects, particularly in inspections like cargo containers or vehicles.
Innovation Solution
The method involves scanning an object from multiple perspectives using rotating pencil beam radiation collimators, where each collimator is sequenced to operate at different times, but an alternate approach allows simultaneous imaging from multiple perspectives by using a configuration where scan lines from different perspectives are initiated at approximately the same time and are orthogonally oriented, reducing cross-talk and increasing imaging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple CBI beams are used concurrently to speed up inspection, then productivity is improved, but cross-talk between beams causes noise and measurement precision deteriorates
Solution Approach 1:
The system uses time-phase sequencing where multiple CBI beams are activated in periodic sequences rather than concurrently. Each beam operates in alternating time slots, ensuring that backscatter from one beam does not interfere with another beam's detector, thereby eliminating cross-talk while maintaining high inspection throughput through rapid switching between beams
2Measurement precision
If CBI beams are time-phased to avoid cross-talk, then measurement precision is improved, but the radiation source is used inefficiently and productivity deteriorates
Solution Approach 1:
The system implements rapid periodic switching between multiple time-phased beams, where each beam is activated in quick succession. This allows the radiation source to be utilized efficiently across multiple beams over time, achieving both high signal clarity during each beam's active period and high overall productivity through the periodic cycling of all beams
Solution Approach 2:
The system pre-sequences the activation timing of multiple beams in advance, optimizing the time-phase schedule to maximize source utilization. By planning the beam activation sequence beforehand, the system ensures that each beam receives adequate activation time while maintaining continuous operation, thereby improving both measurement precision and productivity
3Productivity
If multiple CBI beams are used to construct 3-D images, then productivity is improved, but device complexity increases due to multiple detectors and coordination requirements
Solution Approach 1:
The system divides the imaging task into multiple segmented beams, each responsible for a specific angular perspective or spatial region. By segmenting the overall imaging function into discrete beam components that can be independently controlled and time-phased, the system manages complexity through modular organization while achieving high productivity through parallel segmented operations
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 enables the collection of more imaging data in a shorter period, resulting in higher resolution images and faster scanning without the limitations of time-domain sequencing, thus improving the efficiency of the inspection process.
Implementation Method 1
Compton backscatter imaging (CBI) is a single-sided imaging technique in which the radiation source and the detection/imaging device are located on the same side of the object
Implementation Method 2
Changes in the backscatter photon field intensity (resulting in contrast changes in images) are caused by differences in absorption and scattering cross sections along the path of the scattered photons
Implementation Method 3
the penetrating abilities of radiation, and unique interaction properties of radiation with matter
Data Source
AI summary
Systems and methods for scanning an object in an inspection space are disclosed. The systems and methods generally incorporate spatially separated and sequenced Compton x-ray backscatter imaging techniques in a plurality of perspective planes. Such processes as time-gating detectors, weighting scintillation detections, and preferentially accepting signals that originate from a point that is substantially orthogonal to a radiation detector and at least partially shielding out signals that do not originate from a point substantially orthogonal to the detector may be used to enhance the data acquisition process.