Multi-Layer Multi-Leaf Collimation Aperture Resolution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-leaf collimators face limitations in beam-shaping resolution due to the maximum dimension of their leaves, which can result in radiation beams not perfectly matching treatment requirements, leading to suboptimal dosing in radiation therapy.
Innovation Solution
A multi-layer multi-leaf collimation system is employed, where a first layer of collimation leaves is vertically offset with respect to a second layer, and a control circuit generates a final radiation treatment plan that optimizes the positions of the collimation leaves to improve beam-shaping resolution, allowing for apertures that cannot be produced by a single-layer system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single-layer multi-leaf collimator is used, then the device complexity is low, but the aperture resolution is limited by the leaf dimension
Solution Approach 1:
The patent transitions from a single-layer collimation system to a multi-layer collimation system, adding the dimension of depth (z-axis) to the traditional two-dimensional leaf arrangement. This allows leaves in different layers to be positioned at different depths along the beam path, enabling aperture resolutions finer than the individual leaf dimensions by combining contributions from multiple layers.
Solution Approach 2:
The collimation function is segmented across multiple layers, with each layer containing a subset of leaves that contribute to the overall aperture formation. Instead of relying on a single layer with fine-resolution leaves, the system divides the collimation task across multiple coarser layers, where the combined effect achieves the desired resolution.
2Manufacturing precision
If leaves are made smaller to improve resolution, then the aperture resolution improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Rather than reducing leaf size in a single layer (which would increase manufacturing difficulty), the patent adds a third dimension by stacking multiple layers at different depths. Each layer can use larger, easier-to-manufacture leaves, while the multi-layer arrangement achieves the equivalent of smaller effective aperture dimensions through spatial composition.
Solution Approach 2:
The collimation function is divided across multiple layers, allowing each layer to use larger, more manufacturable leaves. The segmentation of the collimation task across layers enables the system to achieve fine resolution without requiring individually small leaves, thus easing manufacturing constraints.
Data Source
AI summary
A multi-layer multi-leaf collimation system includes at least a first layer of collimation leaves that are vertically offset with respect to a second layer of collimation leaves. A control circuit generates a preliminary radiation treatment plan using a model of a radiation therapy treatment platform using a single-layer multi-leaf collimation system following which the control circuit generates a final radiation treatment plan that takes into account at least a second layer of collimation leaves. The resultant final radiation treatment plan can then be used to administer radiation to a patient using the aforementioned multi-layer multi-leaf collimation system.