Radiotherapy Treatment Planning with Dynamic Multi-Leaf Collimator Control
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Solution Overview
Problem
Current radiotherapy techniques face challenges in achieving precise dose distribution, particularly in directional radiosurgery, where continuous adjustment of radiation dose is not possible, leading to reduced treatment accuracy and high failure rates due to complex multi-leaf collimator structures.
Innovation Solution
A treatment planning method and system that utilize a processor to generate and compare radiation dose distribution schemes based on rotational and swing angles, beam energy, radiation time, and distance from the radioactive source to the target region, using a function f(Φ, θ, B, D, t, d), allowing for continuous adjustment of radiation angles and collimator sizes to achieve a dose distribution closest to a preset scheme without altering hardware configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple collimators with different apertures are used to adjust the dose, then the radiation dose distribution can be modified, but continuous adjustment is not possible and treatment accuracy is reduced
Solution Approach 1:
The patent applies the dynamics principle by replacing static collimators with fixed apertures with a dynamic multi-leaf collimator system that can continuously adjust the radiation field shape and size. The multi-leaf collimator leaves can move independently to create variable aperture shapes and sizes, enabling continuous dose adjustment while maintaining treatment accuracy through precise mechanical control and computerized positioning.
Solution Approach 2:
The patent implements parameter changes by varying the positions of the multi-leaf collimator leaves to continuously modify the radiation field parameters (aperture size, shape, and position). This allows the system to achieve a range of dose distributions by changing the geometric parameters of the collimator opening rather than being limited to fixed discrete settings.
2Adaptability or versatility
If the window shape of a multi-leaf grating is changed to adjust the dose, then radiation dose distribution can be modified, but the structure becomes complicated resulting in a high failure rate
Solution Approach 1:
The patent applies segmentation by dividing the collimator into multiple independent leaves that can move separately. Each leaf can be controlled independently to create complex radiation field shapes while maintaining the structural integrity of individual components. This segmentation allows for flexible dose distribution control while reducing the complexity of the overall mechanism compared to a single movable window.
Solution Approach 2:
The patent replaces complex mechanical window-shaping mechanisms with a more reliable multi-leaf collimator system driven by computer-controlled actuators. This substitution eliminates the need for complex movable window mechanisms while achieving the same dose distribution control through coordinated movement of multiple simpler leaf components.
3Manufacturing precision
If continuous adjustment of radiation dose is enabled, then treatment accuracy is improved, but hardware configuration changes are required
Solution Approach 1:
The patent implements universality by designing a multi-leaf collimator system that can perform multiple functions: it can adjust aperture size, change field shape, position the radiation beam, and control dose distribution. This single multi-functional device replaces what would otherwise require multiple separate hardware components, achieving continuous dose adjustment without proportionally increasing overall system complexity.
Data Source
AI summary
A method of making a treatment plan with a treatment planning system and radiotherapy system are provided. The method includes: acquiring a preset dose distribution scheme; generating at least one radiation dose distribution scheme to be used with the treatment planning system, wherein the treatment plan system is adapted to at least one of beam energy of the radiotherapy system, a size of a collimator of the radiotherapy system, a radiation angle and radiation time of the radiotherapy system; and comparing the at least one radiation dose distribution scheme to be used with the preset dose distribution scheme, and determining, among the at least one radiation dose distribution scheme, a radiation dose distribution scheme that is the closest to the preset dose distribution scheme to make the treatment plan.