Brachytherapy Dose Calculation Using Heterogeneity-Based Algorithm Switching
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Solution Overview
Problem
Existing brachytherapy dose calculation methods are either inaccurate due to simplifying assumptions or too time-consuming for clinical use, particularly when dealing with heterogeneous tissue properties.
Innovation Solution
A method that combines different dose calculation algorithms based on a heterogeneity index to select the most suitable algorithm for each dwell position, using faster but less accurate methods for homogeneous areas and slower but more accurate methods for heterogeneous areas, optimizing calculation time and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If analytical algorithms with simplified assumptions are used for dose calculation, then calculation speed is improved, but measurement precision deteriorates
Solution Approach 1:
The patent applies different calculation algorithms to different spatial regions based on tissue heterogeneity. Homogeneous regions use fast analytical algorithms while heterogeneous regions use accurate Monte Carlo algorithms, creating local optimization of calculation methods matched to local tissue properties
Solution Approach 2:
The patent changes the calculation algorithm parameter based on the heterogeneity index of each dwell position. When the heterogeneity index exceeds a threshold, the system switches from analytical to Monte Carlo algorithms, dynamically adjusting computational precision to match tissue complexity
2Measurement precision
If Monte Carlo dose engine is used for accurate dose calculation, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent restricts the use of computationally intensive Monte Carlo algorithms to only those regions where tissue heterogeneity demands high precision. By calculating the heterogeneity index for each dwell position and applying Monte Carlo only when necessary, the system achieves accurate dosimetry where needed while minimizing overall computation time
Solution Approach 2:
The patent applies full Monte Carlo simulation only partially - specifically to dwell positions with high heterogeneity indices - rather than uniformly to all positions. This partial application of the most accurate method achieves sufficient precision for complex regions without the excessive time cost of universal application
Data Source
AI summary
A dose calculation method for brachytherapy treatment, is disclosed, in which radiation is provided by one or more radiation sources from at least a first and a second dwell position within a patient. The method comprises performing a first dose calculation for the first dwell position according to a first dose calculation algorithm and a second dose calculation for the second dwell position according to a second dose calculation algorithm, and using the sum of the first dose calculation and the second dose calculations as the total calculated dose. Different dose engines with different properties can be combined to provide time-efficient calculations with satisfactory accuracy.