MRE Phantom Geometric Wavelength Control
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Solution Overview
Problem
Current magnetic resonance elastography (MRE) calibration phantoms rely on materials with unknown and variable mechanical properties, requiring frequent replacement and posing challenges for long-term studies and multi-site consistency.
Innovation Solution
A phantom system that generates a wave-like pattern with a geometrically controlled wavelength, using an MRI-visible structure and supports to create alternating phases, independent of material properties, allowing for consistent calibration and mechanical property calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specialized materials with known stiffness are used to create MRE calibration phantoms, then the phantoms provide consistent calibration properties, but the material properties change over time and require frequent replacement
Solution Approach 1:
The invention changes the fundamental parameter from material-dependent stiffness to geometry-dependent wavelength. By using the relationship λ = 2h√(G/ρ) where wavelength λ is determined by phantom thickness h and material properties G (shear modulus) and ρ (density), the system allows calibration based on easily measurable geometric parameters rather than unstable material properties. The phantom uses a simple container filled with water or MRI-visible gel, where the wavelength is controlled by the container thickness rather than specialized material composition.
2Measurement precision
If specialized MR-visible elastography materials are used, then the phantoms are visible and measurable by MRI, but the manufacturing process variations cause property inconsistencies across different sites
Solution Approach 1:
The invention extracts the calibration function from the material properties and places it in the geometric structure. Instead of relying on specially formulated elastography materials with controlled stiffness, the system uses a simple container (can be any MRI-visible container) filled with water or gel, where the critical calibration parameter (wavelength) is determined by the container thickness rather than material composition. This eliminates manufacturing variability associated with specialized materials.
Solution Approach 2:
The invention changes the controlling parameter from material composition (hard to control uniformly) to geometric dimension (easy to control uniformly). The wavelength λ is determined by the phantom thickness h and the relationship λ = 2h√(G/ρ), allowing calibration based on precisely measurable geometric parameters rather than variable material properties.
3Ease of operation
If phantoms are designed with fixed material properties, then calibration can be performed, but the properties change over time requiring regular replacement
Solution Approach 1:
The invention replaces the mechanical property-dependent system with a geometry-dependent system. Instead of relying on the mechanical stiffness of specialized materials, the calibration phantom uses the geometric relationship λ = 2h√(G/ρ) where the wavelength is determined by container thickness. This substitution makes the system reliable because geometric dimensions are stable over time, unlike material properties that degrade.
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 and consistent MRE image acquisition and mechanical property calculation, reducing the need for frequent phantom replacement and ensuring multi-site consistency by geometrically controlling the wavelength of the wave-like pattern.
Implementation Method 1
Repeated motion of the second plurality of moveable supports in a displacement direction causes displacement of the MRI visible structure to create a wave-like pattern in the MRI visible structure
Implementation Method 2
The shear waves are then imaged with a phase-contrast MRI pulse sequence with motion-encoding gradients synchronized with the applied vibration
Data Source
AI summary
A phantom for magnetic resonance elastography (MRE) is provided. In particular, systems and methods for a phantom that is capable of generating a wave-like pattern in MRE images where a wavelength of the generated wave-like pattern is controlled by the phantom geometry. The geometrically controlled wavelength enables the phantom to calibrate MRE image acquisition and mechanical property calculation.