Arc Treatment Plan Segmentation Under Source Speed Limits
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Solution Overview
Problem
Existing radiation therapy methods face challenges in delivering a prescription dose to target regions within an arc range due to insufficient rotation speed of the radiation source, necessitating lengthy and cumbersome adjustments to treatment plans.
Innovation Solution
A method for generating an arc treatment plan by partitioning a region of interest into sub-regions with irradiation durations less than a predetermined value, ensuring the sum of these durations equals the original duration, and maintaining the same arc range and position, allowing the radiation source to move back and forth within the arc range to deliver the desired dose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the radiation device rotates at minimum rotation speed to deliver prescription dose, then the dose delivery is optimized, but the arc range becomes insufficient and the treatment plan cannot be performed
Solution Approach 1:
The patent divides the target region into multiple sub-regions, each irradiated by a separate arc segment. This segmentation allows the treatment plan to achieve the required dose delivery precision for each sub-region while using smaller, feasible arc ranges that the radiation device can actually perform within its minimum rotation speed constraints.
2Reliability
If the treatment plan is modified by adjusting desired dose and weight parameters, then the treatment plan becomes performable, but the plan generation time and complexity increase significantly
Solution Approach 1:
The patent performs preliminary segmentation of the target region into sub-regions before treatment plan generation. This preliminary action structures the target volume in advance, enabling the planning system to directly generate performable treatment plans without requiring time-consuming iterative adjustments of dose and weight parameters, thus reducing plan generation time while ensuring performability.
3Manufacturing precision
If the radiation source rotates slower to deliver prescription dose within arc range, then dose delivery is achievable, but the irradiation duration exceeds the predetermined value
Solution Approach 1:
By segmenting the target region into multiple sub-regions, the patent distributes the total prescription dose across multiple shorter irradiation events. Each sub-region receives its dose within a shorter arc segment, reducing the irradiation duration for each segment below the predetermined value while collectively delivering the full prescription dose to the entire target volume.
Data Source
AI summary
Provided is a method for generating an arc treatment plan. The method for generating the arc treatment plan includes: generating a plurality of sub-regions by partitioning a region of interest based on an irradiation duration corresponding to the region of interest in a target volume; and generating the arc treatment plan for the target volume based on the plurality of sub-regions and irradiation durations corresponding to the plurality of sub-regions; wherein the irradiation durations corresponding to the plurality of sub-regions are all less than or equal to a predetermined value, a sum of the irradiation durations corresponding to the plurality of sub-regions is equal to an irradiation duration corresponding to the region of interest, and irradiation positions corresponding to the plurality of sub-regions are the same as an irradiation position corresponding to the region of interest.