Collimator Dose Correction via 3D Scattering Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current radiation therapy planning oversimplifies the role of patient collimator thickness and beam scattering, leading to inaccuracies in dose delivery, particularly at the treatment margins and surrounding healthy tissue.
Innovation Solution
A method that projects points of interest onto a plane defined by the collimator's sectional contour, forming intersecting straight lines to evaluate dose corrections, accounting for non-zero thickness and beam scattering effects, and applying these corrections to refine treatment plans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If prior art planning reduces the block to a two-dimensional object for computational simplicity, then computational complexity is reduced, but manufacturing precision and measurement precision deteriorate due to ignoring block thickness effects
Solution Approach 1:
The patent transitions from a two-dimensional block representation to a three-dimensional representation that incorporates block thickness. By considering the block as a volumetric object with non-zero thickness, the method accounts for scattering effects and geometric corrections that were previously neglected, thereby improving dose delivery precision while maintaining computational feasibility through efficient algorithms.
2Device complexity
If prior art planning ignores beam scattering off the block material, then computational complexity is reduced, but measurement precision deteriorates due to inaccurate dose calculation at margins
Solution Approach 1:
The patent introduces scattering correction factors as intermediary computational elements that account for beam scattering off the block material. These correction factors are calculated based on the block's physical properties, thickness, and position, then applied to modify the primary dose calculation. This intermediary approach enables accurate inclusion of scattering effects without requiring full Monte Carlo simulation complexity.
3Ease of operation
If the block thickness is neglected in treatment planning, then ease of operation is improved, but reliability deteriorates due to inaccurate dose delivery at treatment margins
Solution Approach 1:
The patent performs preliminary calculations of scattering corrections and geometric modifications based on the block's three-dimensional geometry before final dose calculation. By pre-computing correction factors for block thickness effects and scattering, the method integrates these considerations seamlessly into the treatment planning workflow, maintaining ease of operation while improving reliability through more accurate dose predictions at treatment margins.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for more accurate dose delivery by accounting for higher-order effects, reducing computational complexity and enhancing the precision of radiation therapy treatment plans, making it suitable for modern therapeutic applications.
Implementation Method 1
Another such factor is scattering of the beam off the material of the block
Data Source
AI summary
Information is provided regarding a block's sectional contour in a particular plane as corresponds to a radiation-therapy beam. For a point at which block effects are to be assessed, a point is projected onto a plane of the block and a plurality of straight lines is then formed. Each line has a particular relationship with respect to the projected point (such as having each such line intersect all others at the projected point). Intersections amongst these straight lines and the contour are used to evaluate corrections to the dose at the point. These teachings will accommodate identifying line segments that are located within the contour and that are bound by the intersections with the contour. Elementary contributions as correspond to each of these line segments can be averaged to evaluate delivered dose corrections that are due to the presence of beam-limiting and beam-shaping devices in the particular treatment plan.