Brachytherapy Planning System Image Registration
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Solution Overview
Problem
Prostate position and size changes between initial imaging and treatment delivery in brachytherapy, leading to potential mis-positioning of radioactive seeds or catheters and increased risk of intercepting critical organs, which existing systems do not adequately account for.
Innovation Solution
A brachytherapy treatment planning system that includes a processor to receive planning and pre-treatment images, perform registration to map seed or catheter positions, and generate revised plans based on updated anatomy, minimizing the risk of mis-positioning and ensuring effective dose distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If treatment planning is based on initial imaging only, then treatment plan generation is efficient, but prostate position and size changes lead to mis-positioning of radioactive seeds or catheters
Solution Approach 1:
The system performs registration between the planning image and pre-treatment image before the actual treatment delivery. This preliminary action maps the prostate anatomy at the time of treatment to the original planning image, allowing the treatment plan to be adjusted in advance to account for any changes in prostate position or size, thereby ensuring accurate seed or catheter placement without delaying the treatment process
Solution Approach 2:
The system introduces feedback by comparing the pre-treatment image with the original planning image to detect changes in prostate anatomy. This feedback loop allows the treatment planning system to identify and compensate for position and size changes, ensuring that the treatment plan remains accurate despite temporal changes in the patient's anatomy
2Productivity
If treatment plan is not updated for anatomy changes, then treatment delivery is fast, but risk of intercepting critical organs increases
Solution Approach 1:
The system performs the registration and plan update process as a preliminary step before treatment delivery. By mapping the pre-treatment anatomy to the planning image and adjusting the treatment plan in advance, the system ensures that critical organs are avoided while maintaining efficient treatment delivery without requiring delays or re-planning during the actual procedure
3Measurement precision
If registration between planning and pre-treatment images is performed, then positioning accuracy is improved, but system complexity increases
Solution Approach 1:
The system introduces an intermediary computational layer that performs registration between the planning image and pre-treatment image. This intermediary process automatically maps anatomical structures and transforms coordinates, bridging the gap between the two imaging time points without requiring complex manual intervention or overly sophisticated hardware, thereby achieving high measurement precision with manageable system complexity
Data Source
AI summary
A brachytherapy treatment planning system includes a processor that: receives a planning image corresponding to at least a portion of a prostate; generates a brachytherapy treatment plan comprising, for each of a plurality of brachytherapy seeds or catheters, a corresponding brachytherapy seed or catheter position in the planning image such that the plurality of brachytherapy seed or catheter positions in the planning image together satisfy a desired radioactive dose objective in the prostate; receives a pre-treatment image corresponding to the at least a portion of a prostate; and maps each brachytherapy seed or catheter position in the planning image to a corresponding position in the pre-treatment image by performing a registration between the planning image and the pre-treatment image.