Optical Water Surface Detector for LINAC Calibration
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Solution Overview
Problem
Existing methods for positioning a radiation detector in a water phantom for medical linear accelerator quality control are subjective and prone to errors due to water meniscus and parallax effects, leading to inaccuracies in radiation measurements.
Innovation Solution
An optical water surface detector uses reflected light to automatically and precisely locate the water surface within the phantom, eliminating subjectivity and enhancing accuracy by maximizing light reflection at a specific depth, which is then correlated to the water surface level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual positioning method is used to position the radiation detector at the water surface, then the process can be completed with simple equipment, but the positioning accuracy deteriorates due to water meniscus and parallax effects
Solution Approach 1:
The patent replaces the manual mechanical positioning system with an optical detection system. A light source and light detector are used to automatically detect the water surface position by measuring light reflection, eliminating the need for manual visual alignment and thereby improving positioning accuracy while removing subjectivity and parallax errors inherent in manual methods.
Solution Approach 2:
The patent introduces light as an intermediary to detect the water surface position. The light source emits light that reflects off the water surface, and the light detector measures the reflected light to determine the surface position. This intermediary approach allows for precise, automated detection without direct contact or disturbance to the water surface.
2Device complexity
If manual positioning method is used, then the equipment setup is simple, but the time required for positioning increases due to the need for double and triple checking
Solution Approach 1:
The optical detection system is self-acting and automatically determines the water surface position without requiring human intervention or verification. The system performs the positioning task independently by detecting light reflection, eliminating the time-consuming manual checking process while maintaining simplicity in the overall setup.
3Measurement precision
If automated optical detection is implemented, then the positioning accuracy is improved, but the device complexity increases due to additional components
Solution Approach 1:
The patent replaces complex manual positioning procedures with a relatively simple optical detection system consisting of a light source and light detector. This substitution achieves high automation and precision while keeping the added complexity minimal, as the optical components are straightforward and integrate easily with the existing positioning mechanism.
4Ease of operation
If manual positioning is used, then the setup is straightforward, but subjectivity in positioning leads to errors
Solution Approach 1:
The patent replaces subjective manual positioning with an objective optical detection system. The light-based measurement provides quantitative, repeatable data about the water surface position, eliminating human subjectivity and variability. The system automatically converts light reflection measurements into precise positional information, ensuring consistent and reliable results.
Solution Approach 2:
The optical detection system provides real-time feedback about the water surface position to the control system. This feedback mechanism allows for automatic adjustment and verification of the detector position, ensuring that the system consistently achieves accurate positioning without relying on human judgment or manual checking.
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 provides a completely automated method for accurately positioning the radiation detector, significantly reducing errors and increasing efficiency in radiation measurements, ensuring precise delivery of radiation therapy.
Implementation Method 1
This is done by using the light reflected off the bottom of the water surface to identify a distance d below the surface of the water.
Data Source
AI summary
A device and method to be used in the calibration process for a linear accelerator (LINAC). The optical water surface detector device allows the accurate determine of the height of the water surface in a tank. The device housing includes a light source and a light receiver. The housing can also include a circuit board. The device is mounted on an arm attached to a vertical position mechanism mounted within the tank. The light source within the device is controlled by a main control unit which also receives signals from the receiver and determines the amount of light striking the receiver. The control unit also controls the position of the vertical position mechanism and thus the arm on which the device is mounted.