Radiation Therapy QA System Using Image Center Point Tracking
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Solution Overview
Problem
Current mechanical quality assurance methods for radiation therapy equipment lack precision and objectivity, failing to meet the high accuracy requirements of advanced treatments like SBRT, SRS, and IMRT, and do not provide objective data for evaluating the equipment's performance.
Innovation Solution
A quality assurance system that captures images of moving components using an image capturing unit, processes these images to extract center points, and evaluates the equipment's quality based on the movement range of these points, providing objective data for determining the operational state and necessary corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual verification methods are used to check geometry centers, then the evaluation process is simple, but measurement precision is insufficient (greater than 1 mm error)
Solution Approach 1:
The patent replaces manual visual verification with an automated image processing system. A camera captures images of indicating parts, and computer algorithms automatically extract center points and calculate geometry center positions, eliminating subjective human evaluation and achieving sub-millimeter precision through digital image analysis
Solution Approach 2:
The patent uses optical copying by capturing images of indicating parts attached to radiation therapy components. These image copies are then processed to extract precise geometric information, allowing accurate measurement of center points without direct physical contact or manual measurement tools
2Ease of manufacture
If manual evaluation by measurers is used, then the method is easy to implement, but objectivity is very low and results vary between measurers
Solution Approach 1:
The system performs self-evaluation by automatically capturing images, processing them through algorithms, and calculating geometry center positions without human intervention. The automated image processing and center point extraction eliminate inter-measurer variability and ensure consistent, objective results across different evaluations
Solution Approach 2:
The system provides automated feedback by calculating the position of geometry centers and comparing them against reference values. The image processing system continuously monitors and evaluates the radiation therapy equipment, providing objective data that can trigger alerts or corrections when deviations exceed acceptable thresholds
3Device complexity
If existing quality assurance methods are used, then the process is simple, but precision requirements for SBRT, SRS, IMRT treatments are not met
Solution Approach 1:
The patent transitions from two-dimensional visual inspection to three-dimensional spatial analysis by capturing images from multiple angles and calculating precise 3D center point coordinates. This dimensional enhancement allows accurate verification of geometry centers in complex radiation therapy equipment configurations, meeting the stringent precision requirements for advanced treatments
Data Source
AI summary
A quality assurance system for radiation therapy equipment includes an image capturing unit installed on radiation therapy equipment and capturing an image of an indicating part indicating an operational state of the radiation therapy equipment, an image processing unit extracting an edge of the indicating part in image captured by the image capturing unit, a center point extraction unit extracting a center point with respect to the edge, and a quality evaluation unit evaluating quality of the radiation therapy equipment by tracking movement of the center point.