Magnetic resonance elastography methodology for the evaluation of tissue engineered construct growth

Evan T. Curtis, Simeng Zhang, Vahid Khalilzad-Sharghi, Thomas Boulet, Shadi F. Othman

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Traditional mechanical testing often results in the destruction of the sample, and in the case of long term tissue engineered construct studies, the use of destructive assessment is not acceptable. A proposed alternative is the use of an imaging process called magnetic resonance elastography. Elastography is a nondestructive method for determining the engineered outcome by measuring local mechanical property values (i.e., complex shear modulus), which are essential markers for identifying the structure and functionality of a tissue. As a noninvasive means for evaluation, the monitoring of engineered constructs with imaging modalities such as magnetic resonance imaging (MRI) has seen increasing interest in the past decade. For example, the magnetic resonance (MR) techniques of diffusion and relaxometry have been able to characterize the changes in chemical and physical properties during engineered tissue development. The method proposed in the following protocol uses microscopic magnetic resonance elastography (μMRE) as a noninvasive MR based technique for measuring the mechanical properties of small soft tissues. MRE is achieved by coupling a sonic mechanical actuator with the tissue of interest and recording the shear wave propagation with an MR scanner. Recently, μMRE has been applied in tissue engineering to acquire essential growth information that is traditionally measured using destructive mechanical macroscopic techniques. In the following procedure, elastography is achieved through the imaging of engineered constructs with a modified Hahn spin-echo sequence coupled with a mechanical actuator. As shown in Figure 1, the modified sequence synchronizes image acquisition with the transmission of external shear waves; subsequently, the motion is sensitized through the use of oscillating bipolar pairs. Following collection of images with positive and negative motion sensitization, complex division of the data produce a shear wave image. Then, the image is assessed using an inversion algorithm to generate a shear stiffness map. The resulting measurements at each voxel have been shown to strongly correlate (R2>0.9914) with data collected using dynamic mechanical analysis. In this study, elastography is integrated into the tissue development process for monitoring human mesenchymal stem cell (hMSC) differentiation into adipogenic and osteogenic constructs as shown in Figure 2.

Original languageEnglish (US)
Article numbere3618
JournalJournal of Visualized Experiments
Issue number60
DOIs
StatePublished - Feb 9 2012

Keywords

  • Adipose TE
  • Bioengineering
  • Biomechanics
  • Elasticity
  • Issue 60
  • Magnetic resonance elastography (MRE)
  • Mesenchymal stem cells
  • Regenerative medicine
  • Tissue engineering (TE)

ASJC Scopus subject areas

  • Neuroscience(all)
  • Chemical Engineering(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

Fingerprint Dive into the research topics of 'Magnetic resonance elastography methodology for the evaluation of tissue engineered construct growth'. Together they form a unique fingerprint.

  • Cite this