EPID-Based Self-Calibrating Radiation Therapy Systems
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Solution Overview
Problem
Current radiation therapy machine tuning, calibration, and verification protocols are slow, inaccurate, and rely on external hardware and subjective human decisions, lacking efficiency and precision.
Innovation Solution
The use of electronic portal imaging devices (EPIDs) for imaging-based methods to automatically tune, calibrate, and verify radiation therapy systems by capturing and analyzing system parameters, enabling automatic adjustment to ensure compliance with predetermined specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional radiation therapy machine tuning and calibration protocols are used, then the system can be calibrated, but the process is slow and requires external hardware and subjective human decisions
Solution Approach 1:
The radiation therapy system performs self-calibration using its own integrated EPID imaging system. The EPID captures images of calibration patterns (such as star patterns or grid patterns) and the system automatically analyzes these images to determine geometric parameters like source-to-imager distance, imager orientation, and isocenter location, eliminating the need for external calibration hardware and subjective human judgment
Solution Approach 2:
The patent replaces traditional mechanical measurement tools and manual calibration procedures with an optical/imaging-based system. The EPID captures optical images of calibration patterns, and image processing algorithms automatically extract geometric parameters, substituting mechanical measurement methods with optical detection and computational analysis
2Measurement precision
If traditional calibration protocols are used, then calibration can be performed, but accuracy is insufficient and operator dependency remains
Solution Approach 1:
The system uses the EPID to capture images during calibration, processes these images to determine geometric parameters, and automatically adjusts system parameters based on the analysis results. This closed-loop feedback mechanism ensures high accuracy by continuously verifying and refining calibration parameters through image analysis
Solution Approach 2:
The EPID creates digital copies (images) of calibration patterns and geometric references. These digital images are then processed through algorithms that extract precise geometric information, replacing the need for direct physical measurement and eliminating operator subjectivity in the calibration process
3Loss of time
If imaging-based automatic calibration is implemented, then processing time is reduced and operator dependency is removed, but the system requires integrated EPID imaging capability
Solution Approach 1:
The EPID serves multiple functions: it is used for both patient imaging during treatment and for calibration/verification of the radiation therapy system. By making the imaging system multi-functional, the patent avoids adding separate dedicated calibration hardware, thus reducing overall system complexity while enabling automatic calibration
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 approach reduces processing time, costs, and operator dependency, providing accurate and efficient calibration and verification of radiation therapy systems, ensuring precise radiation delivery.
Implementation Method 1
electronic portal imaging devices (EPIDs) for capturing various characteristics and parameters of a radiation treatment device using EPID images
Data Source
AI summary
Systems, devices, and methods are presented for automatic tuning, calibration, and verification of radiation therapy systems comprising control elements configured to control parameters of the radiation therapy systems based on images obtained using electronic portal imaging devices (EPIDs) included in the radiation therapy system.