Radiotherapy Planning Device for Moving Target Dose Accuracy
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Solution Overview
Problem
Existing technologies face challenges in accurately measuring and computing the radiation dose for a specific portion within a subject that moves and changes range over time during radiotherapy, leading to potential radiation exposure outside the targeted area.
Innovation Solution
A treatment planning device that computes the position of a specific portion at multiple times using markers, generates three-dimensional range information, and calculates a radiation dose based on representative range information to ensure accurate radiation delivery without exposing non-target areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tracking irradiation is performed by embedding markers and estimating position from marker positions, then the position of the moving specific portion can be followed, but the radiation dose cannot be accurately measured due to the specific portion moving and changing range over time
Solution Approach 1:
The patent performs preliminary actions by computing the specific portion's position at multiple time points before radiation delivery, generating three-dimensional range information at each time point, and creating representative range information that encompasses all possible positions. This advance preparation allows accurate dose computation without needing to measure dose during the actual irradiation of the moving target.
Solution Approach 2:
The patent transitions from two-dimensional marker position data to three-dimensional range information by generating volumetric representations of the specific portion at multiple time points. This dimensional expansion allows comprehensive coverage of the moving target's trajectory and enables accurate dose computation in three-dimensional space, resolving the measurement accuracy problem.
2Manufacturing precision
If radiation is delivered to track a moving specific portion, then the targeted area receives treatment, but radiation may expose non-target areas outside the specific portion
Solution Approach 1:
The system performs preliminary computation of the specific portion's trajectory and generates representative range information encompassing all possible positions before radiation delivery. This advance planning allows precise definition of the irradiation volume, ensuring radiation is delivered only to areas that will contain the specific portion during treatment, thereby preventing exposure of non-target areas.
Solution Approach 2:
The representative range information serves multiple functions: it defines the irradiation target volume, guides radiation delivery positioning, and establishes boundaries to protect non-target areas. This multi-functional data structure enables simultaneous achievement of accurate targeting and harm prevention.
Data Source
AI summary
This treatment planning device calculates position information for specific locations for a plurality of times corresponding to a time course on the basis of the positions of markers positioned in the vicinity of the specific locations, and generates a three-dimensional range for the specific locations for each of the plurality of times. In addition, the treatment planning device generates representative range information, which represents a range that includes the entire three-dimensional ranges for the specific locations for each of the plurality of times when the position information for the specific locations for each of the plurality of times is regarded as the same reference point. Furthermore, the treatment planning device tracks the position information for the specific locations for each of the plurality of times, and calculates the amount of radiation to be emitted in the range for the specific locations represented by representative range information when radiation is emitted for a prescribed time period in the range for the specific locations represented by the representative range information.