X-ray Target Damage Detection via Electron Collector
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Solution Overview
Problem
Faulty design or production processes in x-ray targets of electron accelerators can lead to progressive damage, causing electron penetration and mixing with x-rays, resulting in inaccurate radiation therapy dosimetry and beam performance errors, necessitating a method to detect target damage for timely replacement.
Innovation Solution
An electrically isolated flattening filter or flat metal plate is used as an electron collector to integrate charge from penetrating electrons, with a remote sensor-electronics system measuring voltage levels and triggering a 'TARGET WARNING' message when the charge rate exceeds a preset limit, allowing for continuous monitoring until the target is replaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the x-ray target is used continuously for radiotherapy, then productivity is improved, but target damage occurs progressively leading to electron penetration and dosimetry errors
Solution Approach 1:
The patent implements preliminary detection by monitoring electron penetration through a collector that accumulates charge from electrons passing through the target. The system triggers a warning before complete target failure occurs, allowing preventive replacement and maintaining both continuous operation and target integrity
Solution Approach 2:
The patent establishes a feedback loop where the collector continuously monitors electron penetration and provides real-time information to the control system. When the accumulated charge exceeds a threshold, the system sends a warning signal to stop operation, creating a self-regulating mechanism that prevents target damage while enabling continuous monitoring
2Reliability
If the target is monitored continuously for damage, then reliability is improved, but device complexity increases due to additional detection components
Solution Approach 1:
The patent makes the flattening filter serve a dual function: its original role in beam conditioning and an additional role as an electron collector for damage detection. This multi-functionality enables reliable target monitoring without adding separate detection components, thus improving reliability while minimizing increased device complexity
3Measurement precision
If electron penetration is detected early, then dosimetry accuracy is improved, but loss of time occurs due to target replacement interruptions
Solution Approach 1:
The system performs preliminary detection of target damage before it significantly affects dosimetry accuracy. By triggering warnings at early stages of electron penetration, the system allows planned target replacement during low-usage periods, maintaining dosimetry precision while minimizing disruption to treatment schedules
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 solution enables early detection of target damage, ensuring accurate radiotherapy treatments by providing a warning mechanism that continues until the target is replaced, thereby preventing errors in dosimetry and beam performance.
Implementation Method 1
The consequent charge integration will result in voltage increase on the collector
Data Source
AI summary
An x-ray apparatus includes a source configured to generate electrons, a target configured to produce x-rays upon impingement of electrons, and a detector configured to detect electrons penetrating the target or reflected from the incident face of the target, indicative of damage to the target.