4D CT Motion Modeling for Radiation Therapy Precision
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Solution Overview
Problem
Conventional radiation treatment methods face challenges in accurately targeting moving pathological anatomies due to patient movements, such as breathing, leading to increased exposure of healthy tissues and reduced treatment precision.
Innovation Solution
The use of four-dimensional (4D) CT scanning and motion modeling to account for the motion of target regions during treatment planning, allowing for real-time adjustment of radiation beams to ensure precise dose delivery while minimizing exposure to healthy tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional radiation treatment methods are used without motion accounting, then treatment delivery is simpler and faster, but treatment precision deteriorates and healthy tissue exposure increases
Solution Approach 1:
The patent applies preliminary action by acquiring 4D CT imaging data and creating motion models before the actual radiation treatment. The system pre-characterizes the target region's motion through respiratory cycles, allowing the treatment planning system to account for motion effects in advance. This enables precise dose delivery while maintaining simpler treatment delivery procedures during actual therapy.
2Manufacturing precision
If treatment margins are expanded to account for respiratory motion, then treatment precision is maintained, but the volume of healthy tissue irradiated increases
Solution Approach 1:
The patent segments the treatment planning process into multiple phases: acquiring 4D CT data at different respiratory phases, creating motion models, and using these models to calculate dose distributions. By segmenting the motion characterization into discrete respiratory phases, the system can precisely define the target region's movement trajectory and deliver radiation only to the actual tumor location throughout the respiratory cycle, rather than expanding margins to cover the entire motion envelope.
Solution Approach 2:
The patent introduces a temporal dimension to the treatment planning process by using 4D CT imaging that captures motion through respiratory cycles. This fourth dimension (time) allows the system to model the target region's motion trajectory in 3D space over time, enabling precise dose delivery that accounts for motion without requiring expanded spatial margins. The motion model provides temporal-spatial information that constrains the radiation delivery to the actual tumor position.
3Manufacturing precision
If breath holding or respiratory gating is used to compensate for target motion, then treatment precision improves, but treatment time increases and patient training requirements increase
Solution Approach 1:
The patent applies preliminary action by acquiring comprehensive 4D CT imaging data and creating motion models before treatment. This pre-characterization of respiratory motion allows the treatment planning system to calculate optimal beam directions and dose distributions that account for motion without requiring the patient to hold breath or undergo respiratory gating during treatment. The system uses the pre-acquired motion information to deliver radiation at the correct position throughout the respiratory cycle, eliminating the need for time-consuming breath holding or gating procedures.
Data Source
AI summary
A method and apparatus for treatment planning using four dimensional imaging data.