Motion-Compensated Dose Calculation for Adaptive Radiation Therapy
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Solution Overview
Problem
Existing external beam radiation therapy (EBRT) methods assume a stationary dose distribution, which is not accurate due to patient anatomy changes during treatment, leading to dosimetric errors from weight loss, organ motion, and physiological changes.
Innovation Solution
A treatment planning system that calculates a motion-compensated dose distribution using real-time motion data and temporal delivery metrics to adjust the planned dose distribution, correlating the position of the target and surrounding tissues with the actual dose delivered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a stationary dose distribution assumption is used in treatment planning, then the planning process is simplified and computationally efficient, but the dose estimation accuracy deteriorates due to patient anatomy changes during treatment
Solution Approach 1:
The patent transitions from a static dose distribution model to a dynamic one by incorporating real-time motion tracking data. The system continuously updates the dose calculation based on the actual positions of organs and tumors during treatment, allowing the dose distribution to adapt dynamically to anatomical changes rather than relying on a fixed pre-treatment plan
Solution Approach 2:
The system implements a feedback mechanism where motion tracking devices monitor patient anatomy in real-time during radiation delivery. This motion information is fed back into the dose calculation system, which then adjusts the dose estimation to reflect actual anatomical positions, creating a closed-loop system that continuously verifies and corrects dose delivery
2Measurement precision
If real-time motion tracking and dynamic dose calculation are implemented, then the dose estimation accuracy is improved, but the system complexity and computational requirements increase
Solution Approach 1:
The patent segments the dose calculation process into discrete components corresponding to individual beam segments and control points. By calculating dose contributions from each segment separately and accumulating them over time, the system manages computational complexity through decomposition while maintaining accurate dynamic dose estimation
Solution Approach 2:
The system performs preliminary calculations of dose distributions for each beam segment and control point before actual treatment delivery. These pre-computed dose components are stored and then rapidly combined using measured motion data during treatment, reducing real-time computational burden while maintaining accuracy
Data Source
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AI summary
A treatment planning system for generating patient-specific treatment. The system including one or more processors programmed to receive a radiation treatment plan (RTP) for irradiating a target over the course of one or more treatment fractions, said RTP including a planned dose distribution to be delivered to the target, receive motion data for at least one of the treatment fractions of the RTP, receive temporal delivery metric data for at least one of the treatment fractions of the RTP, calculate a motion-compensated dose distribution for the target using the motion data and the temporal delivery metric data to adjust the planned dose distribution based on the received motion data and temporal delivery metric data, and compare the motion-compensated dose distribution to the planned dose distribution.