MLC Leaf Position Detection Using Optical Feedback Signals
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Solution Overview
Problem
Existing position detection devices for multi-leaf collimators in radiotherapy systems suffer from reliability issues, such as device wear, poor accuracy, and limited applicability in magnetic environments, particularly in image-guided radiotherapy systems.
Innovation Solution
A position detection device comprising a signal emitting component, a signal feedback component, and a processor, which emits and receives signals to determine the moving stroke of a leaf in the multi-leaf collimator, utilizing optical signals and a PIN photoresistor to accurately detect leaf positions in magnetic and radiation environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional contact-based position detection devices are used for MLC leaves, then the device structure is simple, but the reliability deteriorates due to device wear and poor accuracy
Solution Approach 1:
The patent replaces traditional mechanical contact-based position detection devices with an optical detection system. The optical detection device includes a light source that emits light and a photodetector that receives the light to determine leaf position. This substitution eliminates mechanical wear and improves reliability while maintaining acceptable device complexity through the use of non-contact optical components.
2Adaptability or versatility
If existing position detection devices are used in image-guided radiotherapy systems, then the detection mechanism is simple, but the applicability deteriorates in magnetic environments
Solution Approach 1:
The patent employs an optical detection system that is inherently compatible with magnetic environments used in image-guided radiotherapy. By using light-based detection rather than magnetic or mechanical sensors, the system achieves adaptability to magnetic environments without requiring complex shielding or compensation mechanisms.
3Measurement precision
If conventional detection methods are used for MLC leaf position, then the device structure is simple, but the measurement precision deteriorates
Solution Approach 1:
The patent uses optical detection components including a light source and photodetector to achieve precise non-contact measurement of leaf position. The optical system provides high measurement precision by detecting the position through light interaction without mechanical contact, improving accuracy while keeping the device structure relatively simple through the use of standard optical components.
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
The device provides accurate and reliable detection of leaf positions, enhancing the precision of radiation delivery in radiotherapy treatments by overcoming limitations of existing technologies.
Implementation Method 1
A position detection device of a multi-leaf collimator (MLC) includes a signal emitting component, a signal feedback component, and a processor. The signal emitting component is configured to emit a signal. The signal feedback component is configured to receive the signal emitted by the signal emitting component
Implementation Method 2
utilizing optical signals and a PIN photoresistor to accurately detect leaf positions in magnetic and radiation environments
Data Source
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AI summary
A position detection device of a multi-leaf collimator (MLC) is provided. The position detection device includes a signal emitting component, a signal feedback component, and a processor. The signal emitting component is configured to emit a signal. The signal feedback component is configured to receive the signal emitted by the signal emitting component and generate a feedback signal in response to the received signal. Installation positions of the signal emitting component and the signal feedback component are arranged so that the signal emitted by the signal emitting component can be projected onto the signal feedback component. The processor communicatively connected with the signal feedback component and configured to receive the feedback signal from the signal feedback component and determine a moving stroke of a leaf of the MLC based on the feedback signal.