Demonstration of concurrent tensile testing and magnetic resonance elastography

Area of Science:

• Biomedical Engineering
• Medical Imaging
• Materials Science

Background:

• Magnetic Resonance Elastography (MRE) measures soft tissue mechanical properties.
• MRE shows diagnostic potential for fibrogenesis and neurodegeneration.
• Investigating loading conditions during MRE is crucial for understanding organ function.

Purpose of the Study:

• To explore experimental loading during MRE.
• To investigate the relationship between mechanical properties and organ function.
• To demonstrate simultaneous tensile testing with MRE.

Main Methods:

• Acquired 3D MRE data during quasistatic uniaxial tensile loading of a cylindrical specimen.
• Performed MRE scans at 1.5, 2.0, and 2.5kHz across 0% to 140% engineering strain.
• Recorded tensile reaction force using a load cell and analyzed stress-strain relation.

Main Results:

• The tensile stress-strain relation followed the Fung hyperelastic strain energy model.
• Observed a relationship between MRE shear storage modulus and tensile deformation.
• Demonstrated the feasibility of simultaneous tensile testing during MRE.

Conclusions:

• Simultaneous tensile testing during MRE is feasible.
• The developed MRE system can be used for calibration with pre-tension.
• This approach enhances understanding of tissue mechanics under load.