Particle Distribution Modeling for Radiation Dose Accuracy
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Solution Overview
Problem
Current radiation dose calculation methods for radiation delivery technologies have low accuracy due to the lack of consideration for the scattering effect of collimators on particles.
Innovation Solution
A modeling method that determines a source particle distribution and a leaked particle distribution, calculates a first particle ratio, and samples particle motion parameters to create a distribution model of target scattered particles, thereby accounting for collimator scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Monte Carlo algorithm is used to simulate particle motion process, then modeling of particles in radiation delivery device is completed, but accuracy of dose calculation is low due to lack of consideration for collimator scattering effect
Solution Approach 1:
The patent segments the particle distribution into distinct categories: source particles, leaked particles, and scattered particles. Each category is modeled separately with specific distribution functions, allowing the collimator scattering effect to be captured without requiring full Monte Carlo simulation of all particles. This segmentation enables accurate dose calculation while reducing computational complexity.
Solution Approach 2:
The patent introduces an intermediary distribution model for scattered particles that bridges the gap between simple source particle models and complex full Monte Carlo simulations. This intermediary model specifically accounts for collimator scattering effects, improving accuracy without the full computational burden of complete Monte Carlo simulation.
2Reliability
If full Monte Carlo simulation is performed to model all particle interactions, then comprehensive particle behavior is captured, but calculation time is excessive
Solution Approach 1:
The patent applies partial action by modeling only the specific particle components that significantly impact dose calculation accuracy (source particles, leaked particles, and scattered particles) rather than simulating all particle interactions comprehensively. This partial modeling approach captures essential physics while dramatically reducing calculation time compared to full Monte Carlo simulation.
Solution Approach 2:
The patent changes the modeling parameters from full Monte Carlo simulation parameters to simplified distribution functions for specific particle types. By parameterizing the scattered particle distribution based on collimator geometry and material properties rather than simulating each interaction, the model achieves comprehensive particle behavior representation with much faster calculation speed.
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 method improves the accuracy of radiation delivery modeling by considering the collimator's scattering effect and reduces calculation time, enhancing modeling efficiency.
Implementation Method 1
determining particle motion parameters of the target scattered particles by sampling according to the first particle ratio and at least one of the leaked particle distribution, an angular distribution of the target scattered particles, and an energy distribution of the target scattered particles
Implementation Method 2
Current radiation dose calculation methods for radiation delivery technologies have low accuracy due to the lack of consideration for the scattering effect of collimators on particles
Data Source
AI summary
A modeling method includes: determining a source particle distribution and a leaked particle distribution, determining a first particle ratio between target scattered particles and source particles according to the source particle distribution and the leaked particle distribution, and then determining particle motion parameters of the target scattered particles by sampling according to the first particle ratio and at least one of the leaked particle distribution, an angular distribution of the target scattered particles, and an energy distribution of the target scattered particles, so as to determine a distribution model of the target scattered particles based on the particle motion parameters of the target scattered particles.