Multi-Layer MLC Leaf Speed Split for Beam Shaping and Fluence Modulation
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Solution Overview
Problem
Conventional multi-layer multi-leaf collimators are constrained by uniform motion capabilities of their leaf layers, limiting treatment administration efficiency and optimization.
Innovation Solution
A multi-layer multi-leaf collimation system with two layers having different maximum leaf speeds and dimensions, where one layer primarily performs beam shaping and the other modulates fluence distribution, optimizing their movements for specific functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uniform motion capabilities are used for all leaf layers, then device complexity is reduced and ease of operation is improved, but treatment administration efficiency and optimization capability deteriorate
Solution Approach 1:
The patent applies local quality by assigning different motion capabilities to different leaf layers based on their specific functional requirements. The first leaf layer has a first maximum leaf speed optimized for beam shaping, while the second leaf layer has a second maximum leaf speed optimized for fluence modulation. This localized differentiation of motion capabilities allows each layer to be optimized for its specific function, thereby improving overall treatment administration efficiency without requiring uniform complexity across the entire system.
2Adaptability or versatility
If uniform motion capabilities are used for all leaf layers, then ease of operation is improved, but treatment plan optimization capability deteriorates
Solution Approach 1:
The patent implements local quality by configuring different leaf layers with distinct motion capabilities matched to their specific functions. The first layer's motion capabilities are optimized for beam shaping operations, while the second layer's capabilities are optimized for fluence modulation. This localized optimization enhances the system's adaptability and versatility for different treatment scenarios, allowing each layer to contribute maximally to its designated function while maintaining overall system coherence.
3Productivity
If leaf layers are set close to each other, then obstruction is reduced, but the ability to independently optimize leaf movements for different functions deteriorates
Solution Approach 1:
The patent resolves this contradiction by applying local quality to the spatial arrangement and functional assignment of leaf layers. While the layers are positioned close to each other to minimize obstruction and maintain operational efficiency, each layer is independently configured with specific motion capabilities and functional roles. The first layer focuses on beam shaping while the second layer focuses on fluence modulation, allowing independent optimization of leaf movements for different functions despite the close proximity of the layers.
Data Source
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AI summary
A multi-layer multi-leaf collimation system includes at least a two layers of collimation leaves. The first multi-leaf collimator layer is configured to primarily perform a first function to affect a radiation beam traveling from a radiation source to a target and a second multi-leaf collimator layer is configured to primarily perform a second function, different from the first function, to affect the radiation beam for the administration of a treatment plan.