Interchangeable Phantom Inserts for DIR Accuracy Testing
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Solution Overview
Problem
Current methods for testing deformable image registration (DIR) systems are limited by the need for resource-intensive and time-consuming validation processes, particularly in clinical settings, where existing phantoms are either too large, impractical, or lack the ability to simulate a variety of tissue deformations and location changes accurately.
Innovation Solution
A user-friendly, low-cost physical phantom designed to test the accuracy of DIR systems, featuring interchangeable inserts that simulate different tissue shapes and properties, allowing for quantitative measurement of rigid and deformable changes, and compatibility with multiple imaging modalities such as CT, MRI, and PET/SPECT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing physical phantoms are used to test DIR accuracy, then the evaluation can be performed, but the phantoms are too large and impractical for non-academic clinical environments
Solution Approach 1:
The phantom is divided into multiple interchangeable inserts (e.g., lung insert, liver insert, breast insert) that can be separately manufactured, stored, and replaced. Each insert represents a specific organ or tissue type, allowing the base phantom structure to remain compact while providing comprehensive testing capabilities through modular components.
Solution Approach 2:
The phantom base structure serves multiple functions by accommodating different tissue-type inserts. A single phantom platform can evaluate DIR accuracy for various organs (lung, liver, breast, etc.) by simply changing the insert, making it universally applicable across different clinical scenarios without requiring multiple separate phantoms.
2Reliability
If existing physical phantoms are used to test DIR accuracy, then the evaluation can be performed, but they lack the ability to simulate a variety of tissue deformations and location changes accurately
Solution Approach 1:
The phantom incorporates deformable inserts made from elastomeric materials that can be physically deformed to simulate various tissue changes during treatment. The inserts can be compressed, stretched, or contorted to represent different deformation scenarios, enabling the phantom to dynamically adapt to various testing requirements rather than being static.
Solution Approach 2:
The phantom allows changing of inserts with different physical properties (density, elasticity, compressibility) to simulate different tissue types and deformation characteristics. By varying material parameters and geometric configurations of the inserts, the system can accurately represent a wide range of clinical deformation scenarios.
3Measurement precision
If physician-drawn structure contours or landmarks are used for validation, then the evaluation can be performed, but the process is time-consuming and suffers from inter and intra-observer variability
Solution Approach 1:
The phantom replaces the manual mechanical process of physician contour drawing and landmark picking with an automated optical measurement system. Optical markers embedded in the phantom are detected by cameras to automatically calculate deformation vectors, eliminating human observer variability and significantly reducing the time required for validation while maintaining high measurement precision.
4Reliability
If existing phantoms are used, then testing can be performed, but they require special knowledge and materials that are not available to all DIR users
Solution Approach 1:
The phantom uses readily available, off-the-shelf materials such as standard elastomeric sheets, optical markers, and basic mechanical components that can be easily manufactured and replaced. Instead of requiring specialized or expensive materials, the design discards complex material requirements in favor of common items that are accessible to most clinical environments and research facilities.
Data Source
AI summary
Apparatus and methods for evaluating the accuracy of deformable image registration (DIR) systems. Certain aspects may include a base and a support member coupled to the base, where the support member is configured to rotate about a first axis with respect to the base. Particular aspects may include a housing coupled to the support member, where the housing is configured to rotate about a second axis with respect to the support member. Specific aspects may include an insert coupled to the housing, where the insert is configured to rotate about a third axis with respect to the housing.