Deformable Radiotherapy Phantom for Adaptive Treatment Validation
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Solution Overview
Problem
Current radiotherapy techniques face challenges in accurately delivering prescribed radiation doses due to patient anatomy changes, leading to potential underdosing of targets or overdosing of healthy tissues, necessitating effective quality assurance methods to validate treatment plans.
Innovation Solution
A deformable radiotherapy phantom is created using additive manufacturing based on patient medical images, incorporating smart materials for deformation and dosimeters for dose measurement, allowing for validation of treatment plans and deformation modeling to simulate patient motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If adaptive radiotherapy is used to compensate for patient anatomy changes, then treatment accuracy is improved, but the complexity of validating treatment plans increases
Solution Approach 1:
The patent creates a physical phantom that is a copy of the patient's anatomy based on medical images. This phantom replicates the geometric and dosimetric properties of the patient's body, allowing treatment validation without requiring complex measurements on the actual patient. The phantom serves as a simplified model that captures the essential features needed for validation.
Solution Approach 2:
The patent transforms the validation process from direct patient measurement to phantom-based measurement by changing the physical state and properties of the test object. The phantom is designed with specific materials and geometries that replicate patient tissue properties, enabling dose verification through phantom measurements rather than complex patient-specific measurements.
2Adaptability or versatility
If deformable phantoms are used to simulate patient motion, then validation of dose warping becomes possible, but the manufacturing complexity increases
Solution Approach 1:
The patent creates a deformable phantom that can change shape to simulate patient motion and anatomical changes. The phantom incorporates materials and mechanisms that allow it to be deformed into different configurations corresponding to different patient states (e.g., breathing phases, position changes), enabling dynamic validation scenarios without complex manufacturing.
Solution Approach 2:
The patent pre-deforms the phantom to match expected patient anatomical changes before treatment validation. By preparing the phantom in advance with the appropriate deformation state, the need for complex real-time deformation mechanisms is reduced, simplifying the manufacturing while maintaining validation capability.
3Measurement precision
If additive manufacturing is used to create patient-specific phantoms, then measurement accuracy is improved, but the manufacturing time increases
Solution Approach 1:
The patent focuses the phantom manufacturing on only the critical regions that require accurate dosimetry, rather than creating a complete patient-specific model of the entire body. By localizing the high-precision additive manufacturing to specific regions of interest (e.g., tumor target and surrounding organs), the measurement accuracy is maintained while the overall manufacturing time is reduced.
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
The phantom enables accurate prediction and validation of radiation dose distribution, ensuring clinically effective and safe treatment plans by simulating patient anatomy changes and motion, thereby improving treatment precision and safety.
Implementation Method 1
A smart material can allow deformation in response to an applied stimulus
Implementation Method 2
The phantom can include a plurality of dosimeters for measuring a radiation dose distribution
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3
AI summary
A deformable radiotherapy phantom can be produced using an additive manufacturing process, based on a medical image of the patient. The deformable phantom can include dosimeters for measuring radiation dose distribution. A smart material can allow deformation in response to an applied stimulus. Among other things, the phantom can be used to validate radiation dose warping, a radiotherapy treatment plan, to determine a maximum acceptable deformation of the patient, to validate a cumulative accuracy of dose warping and deformable image registration, or the like.