Ion Radiotherapy Plan Robustness Evaluation via Incident Energy
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Solution Overview
Problem
Current methods for ion radiotherapy treatment planning lack robustness evaluation, particularly in addressing uncertainties due to CT calibration, tissue inhomogeneity, and organ motion, which affects the consistency of dose distribution and Bragg peak positioning.
Innovation Solution
A method for evaluating ion radiotherapy treatment plans by calculating and visualizing quantity values representing the incident energy of ions in different portions of the treatment volume, using dose calculation voxels, to assess and improve the plan's robustness, including displaying energy layer distributions and penetration ranges within patient anatomy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current methods for determining robustness (displaying beam dose per energy layer) are used, then the evaluation process is simple, but the robustness evaluation is insufficient and does not address uncertainties in CT calibration, tissue inhomogeneity, and organ motion
Solution Approach 1:
The treatment volume is divided into multiple portions (voxels or regions), and the incident energy is calculated separately for each portion. This segmentation allows comprehensive evaluation of robustness across different regions while maintaining a systematic and manageable evaluation process.
Solution Approach 2:
The evaluation method transitions from displaying only beam dose per energy layer to incorporating a new dimension of information: the incident energy distribution across multiple portions of the treatment volume. This additional dimension provides more comprehensive robustness evaluation without completely redesigning the evaluation system.
2Measurement precision
If the number of portions in the treatment volume is increased for more detailed evaluation, then the robustness assessment becomes more accurate, but the computational complexity and data processing requirements increase
Solution Approach 1:
The system uses a unified approach to calculate incident energy for all portions using the same methodology and data structures. This universal framework allows the system to handle any number of portions efficiently, scaling from coarse to fine evaluations without requiring fundamentally different processing approaches for each level of detail.
3Loss of information
If quantity values representing incident energy are calculated for each portion, then the evaluation provides more comprehensive information about treatment plan quality, but the calculation and visualization requirements increase
Solution Approach 1:
The method combines multiple pieces of information (incident energy values for multiple portions, energy layer distributions, penetration ranges) into a unified visualization framework. By merging these different data types into a single coherent display, the system provides comprehensive information without requiring multiple separate visualization systems.
Data Source
Figure 1~2b
Figure 3~5
AI summary
A method of evaluating the robustness of a radiotherapy treatment plan for ion based radiotherapy, comprises the steps of - Obtaining information related to the incident energy of ions that will stop in each voxel of the treatment volume, - Calculate a quantity value representative of the incident energy of these ions, - Using the quantity values calculated for the first and second portion as a measure of the quality of the radiotherapy treatment plan, in particular its robustness. The information may include the mean incident energy for all ions, and/or an indication of the distribution of the energy values for all the ions.