Respiration Phantom for Dynamic Radiation QA
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Solution Overview
Problem
Conventional alignment markers in radiation treatment systems are static and fail to accurately simulate the dynamic movement of a patient's breathing, leading to potential misalignment and improper radiation delivery.
Innovation Solution
A respiration phantom that mimics human anatomy and moves with respiration-like motion, allowing for dynamic testing of radiation delivery systems to ensure precise alignment and dose distribution, featuring anthropomorphic skeletal and organ components that attenuate radiation similarly to human tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional static alignment markers are used, then the quality assurance mechanism is simple and easy to implement, but the markers cannot accurately simulate patient breathing motion leading to potential misalignment
Solution Approach 1:
The alignment marker is transformed from a static object to a dynamic respiration phantom that moves to simulate patient breathing. The phantom includes a body portion with internal organs that can displace relative to each other, creating realistic respiratory motion patterns during radiation delivery to ensure accurate tracking and alignment.
Solution Approach 2:
The respiration phantom creates a simplified copy of human anatomy with skeletal structures, internal organs, and respiratory motion patterns. This anatomical copy allows the radiation delivery system to test alignment and tracking accuracy on a model that replicates the physical and motion characteristics of a real patient without the risks associated with actual patient treatment.
2Adaptability or versatility
If static alignment markers are used, then the testing process is simple, but the markers do not resemble actual patient anatomy or movement patterns
Solution Approach 1:
The respiration phantom is divided into multiple segmented components including a body portion, skeletal structures, and separate internal organs. These segments can move independently relative to each other to simulate the complex multi-degree-of-freedom respiratory motion patterns that occur during patient breathing, allowing realistic adaptation to various anatomical configurations.
Solution Approach 2:
The phantom system allows adjustment of motion parameters including amplitude, frequency, and phase of respiratory displacement. This enables the device to adapt to different breathing patterns and anatomical variations, transforming the fixed-structure marker into a versatile simulation tool that can replicate diverse patient-specific respiratory characteristics.
3Measurement precision
If conventional alignment markers are used, then the radiation delivery system testing is straightforward, but the system cannot adequately test tracking of moving targets
Solution Approach 1:
The respiration phantom incorporates motion tracking capabilities that provide real-time feedback on the position and movement of internal organs during simulated breathing. This feedback mechanism allows the radiation delivery system to test and verify its ability to track moving targets and adjust beam positioning dynamically, ensuring precise dose delivery to moving tumors while avoiding healthy tissue.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate quality assurance testing of radiation delivery systems by simulating real-world breathing motions, ensuring precise tracking and dose delivery to moving targets within the patient, thereby reducing the risk of misalignment and improving treatment efficacy.
Implementation Method 1
anthropomorphic skeletal and organ components that attenuate radiation similarly to human tissues
Data Source
AI summary
A respiration phantom that may be used to perform quality assurance on a radiation delivery system. The respiration phantom includes a human-like skeletal structure, at least one deformable component, and a respiration actuator. The deformable component is positionable at least partially internal to the human-like skeletal structure, has a shape resembling an organ of a human anatomy, and attenuates radiation substantially similarly to the organ of the human anatomy. The respiration actuator is positioned to deform the deformable component with a respiration-like motion.