X-Ray Linear Accelerator Pulse Monitoring for Energy Drift Control
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Solution Overview
Problem
Existing X-ray scanners face challenges in maintaining consistent radiation output and energy distribution due to environmental and operational variations, leading to inconsistent scan images and material identification issues.
Innovation Solution
A linear accelerator system equipped with a magnetron, electron gun, primary and secondary collimators, attenuating element, and reference detector, which measures X-ray radiation dose and HVL on a pulse-by-pulse basis, using a computing device and programmable logic controller to adjust scan images and correct for energy drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time measurement of X-ray radiation parameters is implemented, then radiation output consistency is improved, but device complexity increases
Solution Approach 1:
A reference detector is positioned within the secondary collimator to directly measure the X-ray beam parameters. This intermediary measurement device provides real-time feedback on radiation output and energy distribution, enabling the control system to maintain consistency without overhauling the entire system architecture.
Solution Approach 2:
The system continuously measures radiation parameters using the reference detector and feeds this information back to the control system. The controller adjusts operational parameters based on this feedback to maintain consistent radiation output, creating a closed-loop control system that resolves the contradiction between reliability and complexity.
2Measurement precision
If pulse-by-pulse measurement of radiation dose and HVL is performed, then energy drift correction is improved, but measurement precision requirements increase
Solution Approach 1:
The reference detector is pre-positioned within the secondary collimator path, and the system is pre-configured with the measurement geometry. This preliminary setup ensures that each pulse's radiation parameters can be measured immediately without requiring complex real-time adjustments or reconfiguration, reducing the difficulty of detection while maintaining precision.
Solution Approach 2:
The reference detector automatically performs pulse-by-pulse measurements of radiation dose and HVL without requiring external intervention. The system self-monitors its own output parameters, generating measurement data that is directly used for energy drift correction, thereby meeting precision requirements while simplifying the measurement process.
3Measurement precision
If reference detector is positioned within secondary collimator, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The reference detector is integrated into the existing secondary collimator assembly, merging the measurement function with the beam-shaping function. This combination allows the detector to be positioned optimally within the collimator structure without requiring a separate measurement device, thereby improving measurement accuracy while minimizing the increase in overall device complexity.
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 real-time monitoring and correction of X-ray radiation parameters, ensuring stable and consistent scan images and accurate material identification across varying conditions.
Implementation Method 1
an electron gun, wherein the electron gun is configured to direct an accelerated beam of electrons at the target, thereby generating a beam of X-rays
Implementation Method 2
an attenuating element positioned proximate the primary collimator... configured to shift data corresponding to a half value layer (HVL) measurement into a region that is less influenced by low-energy components of the beam of X-rays
Implementation Method 3
a reference detector positioned proximate the secondary collimator and configured to generate data indicative of an X-ray radiation dose output on a pulse-by-pulse basis
Data Source
AI summary
A linear accelerator in data communication with a computing device and a programmable logic controller and including a magnetron, an electron gun that is configured to direct an accelerated beam of electrons at a target thereby generating a beam of X-rays, a primary collimator positioned beyond the target in a direction of the beam of X-rays, a secondary collimator coupled to an end of the primary collimator at which the beam of X-rays exit the primary collimator, an attenuating element and a calorimeter positioned within the primary collimator, and a reference detector positioned within the secondary collimator and configured to measure an X-ray radiation dose output of the linear accelerator on a pulse-by-pulse basis.