Anisotropic composite material phantom to improve skeletal muscle characterization using magnetic resonance...

Area of Science:

• Biomedical Engineering
• Medical Imaging Physics
• Musculoskeletal Research

Background:

• Neuromuscular pathologies alter skeletal muscle mechanical properties, necessitating advanced noninvasive monitoring tools.
• Magnetic Resonance Elastography (MRE) shows promise for assessing these changes, but requires accounting for tissue anisotropy.
• Existing elastography methods often assume tissue homogeneity and isotropy, limiting accuracy for fibrous tissues like muscle.

Purpose of the Study:

• To develop and characterize a novel heterogeneous composite phantom with controllable anisotropic properties.
• To create a phantom mimicking the frequency-dependent anisotropic mechanical properties of skeletal muscle.
• To validate the phantom's utility in Magnetic Resonance Elastography (MRE) experiments and finite element (FE) modeling.

Main Methods:

• Designed and 3D-printed a novel heterogeneous composite phantom with anisotropic properties.
• Conducted Magnetic Resonance Elastography (MRE) experiments on the developed phantom.
• Performed computational finite element (FE) studies to simulate MRE experiments and analyze results.

Main Results:

• The phantom exhibited controllable anisotropic mechanical properties comparable to skeletal muscle.
• Experimental and simulated displacement maps showed consistent elliptical wavefronts elongated in the direction of higher stiffness.
• The phantom model demonstrated anisotropy consistent with literature data from skeletal muscle MRE.

Conclusions:

• The developed phantom effectively mimics skeletal muscle's anisotropic and heterogeneous mechanical properties.
• FE simulations aid in interpreting MRE measurements and quantifying anisotropy effects.
• This phantom is a valuable tool for advancing elastography in neuromuscular research and therapy development.