Radiation Transparent 2D Array Detector for IMRT Error Signaling
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Solution Overview
Problem
Current IMRT verification methods are inadequate for detecting delivery errors in radiation therapy, particularly due to limitations in monitoring multi-leaf collimator malfunctions and stochastic errors, which can lead to inaccuracies in dose distribution and treatment planning.
Innovation Solution
A device and method using a radiation transparent 2D array detector between the beam shaping device and the target, capable of providing real-time 2D detector responses, compares measured responses to predicted responses, and signals errors exceeding a given threshold, allowing for immediate operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radiation transparent 2D array detector is used for real-time monitoring, then detection capability and reliability are improved, but device complexity increases
Solution Approach 1:
A radiation transparent 2D array detector is introduced as an intermediary component between the beam shaping device and the target. This detector mediates the verification process by capturing radiation transmission patterns in real-time without significantly attenuating the therapeutic beam, enabling comprehensive monitoring while maintaining treatment effectiveness.
Solution Approach 2:
The 2D array detector serves multiple functions simultaneously: it verifies beam delivery accuracy, monitors multi-leaf collimator positioning, detects stochastic errors, and provides real-time feedback for quality assurance. This multi-functionality consolidates several verification tasks into a single device, improving reliability without proportionally increasing complexity.
2Manufacturing precision
If real-time monitoring is implemented, then delivery accuracy is improved, but processing time and complexity increase
Solution Approach 1:
The verification system operates continuously throughout the entire radiation delivery process rather than performing discrete measurements. The 2D array detector captures transmission patterns in real-time as the beam is delivered, enabling continuous monitoring of beam accuracy and multi-leaf collimator positioning without interrupting treatment or requiring additional measurement time.
Solution Approach 2:
The system replaces complex mechanical measurement devices with a radiation transparent 2D array detector that uses electronic detection and digital processing. This substitution enables faster data acquisition and processing compared to traditional mechanical verification methods, improving delivery accuracy monitoring while reducing processing time.
3Measurement precision
If comprehensive verification of IMRT delivery is performed, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The verification process is segmented into distinct analytical components: beam transmission pattern capture, multi-leaf collimator positioning verification, stochastic error detection, and comparison with treatment planning data. The 2D array detector captures comprehensive spatial information that is then processed through specialized algorithms for each verification aspect, enabling high measurement precision through systematic analysis of segmented verification tasks.
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 real-time monitoring and detection of delivery errors, ensuring accurate radiation therapy delivery by comparing measured and predicted detector responses, thus improving treatment precision and reducing the risk of malfunctions during IMRT treatments.
Implementation Method 1
providing a radiation transparent (2D) array detector between said beam shaping device and said target, capable of providing a measured (2D) detector response of said radiation treatment
Data Source
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AI summary
The present invention relates to a method for monitoring and/or signalling errors of a radiation therapy apparatus during delivery of a radiation treatment to a target, said radiation therapy apparatus being configurable for a given radiation treatment by means of a beam shaping device (MLC), the method comprising the steps of: - providing a radiation transparent array detector (T2D) between said beam shaping device (MLC) and said target, capable of providing a measured detector response (70) of said radiation treatment; - determining a predicted detector response (60) for successive times of said radiation treatment; - measuring said measured detector response (70) caused by the radiation beams for corresponding successive times of said radiation treatment; - performing a comparison (S300) between the measured detector response (70) and the corresponding predicted detector response (60); - signalling in a short reaction time, an error (S400) when said comparison results in a difference which exceeds a given threshold. The present invention also relates to a device comprising electronic 2-dimensional detectors, processing means and a main software (MS).