3D Dose Tracking in IMRT via Fluence Reconstruction
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Solution Overview
Problem
Current radiation therapy verification methods, particularly for Intensity Modulated Radiation Therapy (IMRT), are time-consuming and inadequate in accounting for anatomical changes during treatment, relying on outdated images and requiring multiple irradiation steps, which hampers accurate dose delivery and positioning verification.
Innovation Solution
A device and method for real-time 3D dose tracking using a 2D transmission detector and updated patient images to reconstruct photon fluences and calculate 3D dose distributions, allowing for direct verification on the patient's anatomy without the need for phantoms or repeated irradiations, and enabling comparison with predicted dose distributions for error identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional verification methods using phantoms and multiple irradiation steps are used, then measurement accuracy can be maintained, but verification time increases significantly and anatomical changes during treatment are not accounted for
Solution Approach 1:
The patent uses a 2D transmission detector to capture radiation beam data and creates a digital copy of the patient's anatomy using CT or MRI images. This digital replica allows for virtual dose verification without requiring physical phantoms or additional irradiation steps, thereby reducing verification time while maintaining accuracy through computational dosimetry
Solution Approach 2:
The patent replaces the mechanical phantom-based measurement system with a computational system. Instead of physically irradiating phantoms and measuring with detectors, the system uses software to calculate the actual dose distribution based on treatment plan parameters and patient anatomy images, eliminating the need for repeated mechanical irradiation steps
2Device complexity
If outdated patient images are used for verification, then the verification process can be simpler, but accuracy in accounting for anatomical changes during treatment is compromised
Solution Approach 1:
The patent acquires updated patient anatomy images (CT or MRI) before or during the treatment fraction, prior to the verification calculation. This preliminary updating of anatomical data ensures that the dose verification is performed on current anatomy rather than outdated images from previous fractions, maintaining anatomical accuracy without significantly increasing process complexity
Solution Approach 2:
The patent implements a dynamic verification approach where patient anatomy images are updated for each treatment fraction rather than using static images from the initial treatment planning. This dynamic updating allows the verification system to adapt to anatomical changes such as weight loss, tumor shrinkage, or organ movement that occur during the treatment course
3Reliability
If extensive phantom-based measurements and routine equipment QA tests are performed, then comprehensive verification is achieved, but operational costs and time consumption increase
Solution Approach 1:
The patent enables the treatment planning system to perform self-verification by automatically calculating the delivered dose distribution using the treatment plan parameters and updated patient images. This self-service approach eliminates the need for separate phantom-based measurement campaigns and extensive equipment QA tests, maintaining verification comprehensiveness while improving treatment throughput
Solution Approach 2:
The patent extracts the essential verification function from the complex phantom-based measurement process. By isolating the key input parameters (treatment plan data and patient anatomy) and using computational dosimetry to derive the dose distribution, the system removes the time-consuming and costly phantom measurement steps while retaining the core verification capability
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 significantly reduces verification time, enhances accuracy by using current patient anatomy, and allows for independent 3D dose verification, reducing the risk of errors and operational costs by eliminating the need for extensive phantom-based measurements and routine equipment QA tests.
Implementation Method 1
a transmission electronic 2D detector device capable of measuring 2D responses of said radiation beam in a plane perpendicular to the central axis of said radiation beam
Data Source
AI summary
The present invention relates to a device and method for verification of the quality of a radiation beam in conformal radiation therapy, and in particular for IMRT (Intensity Modulated Radiation Therapy) applications. The actual 3D dose distribution in the patient is tracked during the course of the entire treatment by reconstructing the photon fluences from measured 2D detector responses during irradiation in conjunction with updated patient images.