Dynamic Phantom Movable Chest Wall Respiratory Simulation
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Solution Overview
Problem
Current radiation therapy techniques face challenges in accurately delivering targeted radiation to cancerous tissues while minimizing exposure to healthy tissues, particularly in thoracic and abdominal regions, where internal respiratory and cardiac movements complicate precise positioning of the cancerous volume.
Innovation Solution
A dynamic phantom is developed with movable chest and organ components that mimic human respiratory movements, allowing for simulation of both free breathing and deep inhalation breath-hold techniques, enabling precise tracking and positioning of radiation beams during treatment planning and delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radiation beam is delivered to cancer lesion in thoracic and abdominal regions, then cancer treatment effectiveness is improved, but exposure to healthy tissue increases due to respiratory and cardiac movements
Solution Approach 1:
The phantom employs a movable chest wall mechanism and movable organ members that can dynamically adjust their positions to simulate respiratory movements. This dynamic capability allows the system to model the changing spatial relationships between cancerous tissues and healthy organs during breathing cycles, enabling more accurate radiation delivery planning that accounts for motion-induced exposure variations.
Solution Approach 2:
The system performs preliminary simulation of respiratory movements and organ displacements before actual radiation delivery. By pre-characterizing the motion patterns of the chest wall and internal organs, the system can predict healthy tissue exposure pathways and adjust treatment parameters in advance to minimize harmful exposure while maintaining cancer treatment effectiveness.
2Object-affected harmful factors
If radiation beam is targeted precisely to cancer lesion, then healthy tissue exposure is reduced, but positioning accuracy deteriorates due to movement of cancerous volume during breathing
Solution Approach 1:
The phantom incorporates movable organ members within the movable chest wall structure that can dynamically reposition to track the cancerous volume's movement during simulated breathing. This dynamic tracking capability maintains precise positioning of the target lesion relative to the radiation beam throughout the respiratory cycle, preventing positioning accuracy deterioration despite physiological motion.
Solution Approach 2:
The system uses the movable organ members as feedback mechanisms to monitor and adjust for position changes of the cancerous volume during breathing simulation. By continuously tracking the organ positions and feeding this information back to the radiation delivery system, the system can compensate for motion-induced positioning errors and maintain accurate targeting throughout the treatment process.
3Object-affected harmful factors
If deep inhalation breath-hold technique is used to increase distance between breast and heart, then heart exposure is reduced, but treatment complexity increases
Solution Approach 1:
The phantom enables preliminary simulation and optimization of deep inhalation breath-hold positioning before actual treatment. By pre-establishing the optimal chest wall and organ positions that maximize heart-breast distance, the system simplifies the treatment protocol by providing clear positional targets for breath-hold execution, reducing the complexity of real-time treatment adjustments while maintaining heart protection benefits.
Data Source
AI summary
Described is a dynamic phantom. The phantom comprises a body having a front, a back, and an internal cavity between the front and the back, the body having a movable chest wall. The phantom also comprises a first motion mechanism that is actuated to move the chest wall to thereby move the front relative to the back of the body. The phantom also comprises a moveable organ member supported within the internal cavity that is caused to move relative to the body by a second motion mechanism. The phantom also comprises a drive source for driving the first and second motion mechanisms, wherein the first and second motion mechanisms move the chest wall and the moveable organ member to substantially represent their movement in a human body.