Gantry Rotation Speed Control for Dynamic Radiation Therapy
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Solution Overview
Problem
Existing radiation therapy systems face challenges in determining the optimal rotation speed of the gantry, which affects the stability and efficiency of dynamic therapy plans.
Innovation Solution
A method and device for determining the rotation speed of a gantry by acquiring control information, including leaf and dose information at control points, to calculate the required rotation speed and adjust it based on dose rates and maximum equipment capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gantry rotation speed is increased to improve therapy efficiency, then productivity is improved, but the stability and precision of dose delivery deteriorates
Solution Approach 1:
The patent applies dynamics by making the gantry rotation speed variable rather than constant. The system dynamically adjusts the rotation speed at different angular positions based on real-time dose rate requirements and multi-leaf grating movement needs, allowing the system to optimize between speed and precision at each moment of the therapy delivery
Solution Approach 2:
The system changes the rotation speed parameter continuously throughout the therapy arc based on calculated requirements. By computing the optimal rotation speed at each control point considering dose rates and leaf movement distances, the system adapts the rotational parameter to maintain both efficiency and therapeutic accuracy
2Manufacturing precision
If the gantry rotation speed is decreased to improve dose delivery precision, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The system uses dynamic speed adjustment where the gantry rotates faster when precision requirements are lower and slows down when precise dose delivery or leaf positioning is required. This dynamic approach maintains high overall productivity while ensuring precision is achieved at critical moments
Solution Approach 2:
The system performs preliminary calculation of the optimal rotation speed profile before therapy begins, based on the treatment plan, dose distribution requirements, and multi-leaf grating characteristics. This pre-computed speed profile enables the system to execute the therapy with optimal balance between speed and precision without real-time complex calculations
3Manufacturing precision
If the rotation speed is dynamically adjusted based on dose rates, then the accuracy of dose delivery is improved, but the device complexity increases
Solution Approach 1:
The system implements feedback control by continuously monitoring the actual dose rates during therapy delivery and comparing them with the planned dose rates. Based on this feedback, the system adjusts the gantry rotation speed to ensure that the cumulative dose delivered matches the prescribed dose distribution, thereby improving dose delivery accuracy
Solution Approach 2:
The patent replaces complex mechanical speed control mechanisms with computational methods. Instead of using mechanical devices to physically adjust speed, the system uses software algorithms to calculate optimal speeds and controls the gantry through electronic control systems, reducing mechanical complexity while maintaining precision
Data Source
AI summary
Provided is a method for determining a rotation speed of a gantry. The method includes: acquiring control information of the gantry, wherein the control information of the gantry includes: leaf information and dose information of control points; determining the rotation speed of the gantry and dose rates at the control points based on the leaf information and the dose information of the control points; and adjusting the rotation speed of the gantry based on the dose rates at the control points and a maximum equipment dose rate.