Radiation Dose Determination via Iterative Fluence Map Refinement
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Solution Overview
Problem
Current methods for determining radiation dose distribution in radiotherapy lack accuracy, which affects the evaluation of radiation effects and the reconstruction of actual three-dimensional radiation doses received by patients during treatment.
Innovation Solution
A system that includes a processor and storage device to obtain and process data related to radiation sources, auxiliary images, and initial fluence maps, iteratively determining target fluence maps and scanning images to calculate the radiation dose received by patients at specific time points, using Monte Carlo methods and image processing algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods are used to determine radiation dose distribution, then the calculation process is simple, but the accuracy of radiation dose calculation is insufficient
Solution Approach 1:
The system performs preliminary actions by obtaining radiation auxiliary images and scanning images before the main dose calculation, and by pre-calculating fluence maps through iterative processes. This preparation enables more accurate dose determination while managing computational complexity through structured preprocessing steps.
Solution Approach 2:
The patent introduces fluence maps as intermediary elements between the radiation source and the final dose calculation. By iteratively determining fluence maps based on radiation auxiliary images and scanning images, the system creates intermediate representations that improve measurement precision without directly complicating the final dose computation.
2Measurement precision
If iterative methods are used to determine fluence maps, then the accuracy of fluence map is improved, but the calculation time increases
Solution Approach 1:
The system performs preliminary iterative calculations to determine fluence maps before the final dose calculation. By completing these iterative refinements in advance based on radiation auxiliary images and scanning images, the system achieves accurate fluence maps that can be reused, reducing overall computational time.
Solution Approach 2:
The iterative process for determining fluence maps continues until convergence or a predetermined number of iterations is reached, ensuring continuous refinement of accuracy. This continuous useful action maintains precision while allowing the process to terminate efficiently when sufficient accuracy is achieved.
3Measurement precision
If multiple scanning images are processed to determine target scanning image, then the accuracy of target object representation is improved, but the data processing complexity increases
Solution Approach 1:
The system extracts the target scanning image from multiple scanning images by selecting or combining relevant data. This extraction process isolates the essential representation of the target object at the radiation time point, improving accuracy while managing processing complexity through selective data extraction rather than comprehensive analysis of all images.
Solution Approach 2:
The target scanning image serves as a representative copy or selection from the multiple scanning images, capturing the essential state of the target object at the radiation time point. This copying approach maintains accuracy by preserving critical information while reducing the complexity of processing all original images simultaneously.
Data Source
AI summary
The embodiments of the present disclosure provide a system for determining a radiation dose. The system may include: obtaining data related to radiation source, a radiation auxiliary image of a target object at a target radiation time point, and an initial fluence map corresponding to the target radiation time point; determining a target fluence map corresponding to the target radiation time point by one or more iterations based on the radiation auxiliary image, the initial fluence map, and the data related to radiation source; obtaining a target scanning image of the target object; and determining the radiation dose received by the target object at the target radiation time point, based on the target fluence map, the target scanning image, and the data related to radiation source.