MR elastography of the ex vivo bovine globe

Daniel V. Litwiller, Sung J. Lee, Arunark Kolipaka, Yogesh K. Mariappan, Kevin J. Glaser, Jose S. Pulido, Richard L. Ehman

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

Purpose: To evaluate the feasibility of using MR elastography (MRE) to assess the mechanical properties of the eye. Materials and Methods: The elastic properties of the corneoscleral shell of an intact, enucleated bovine globe specimen were estimated using MRE and finite element modeling (FEM), assuming linear, isotropic behavior. The two-dimensional (2D), axisymetric model geometry was derived from a segmented 2D MR image, and estimations of the Young's modulus in both the cornea and sclera were made at various intraocular pressures using an iterative flexural wave speed matching algorithm. Results: Estimated values of the Young's moduli of the cornea and sclera varied from 40 to 185 kPa and 1 to 7 MPa, respectively, over an intraocular pressure range of 0.85 to 9.05 mmHg (1.2 to 12.3 cmH2O). They also varied exponentially as functions of both wave speed and intraocular dP/dV, an empirical measure of "ocular rigidity." Conclusion: These results show that it is possible to estimate the intrinsic elastic properties of the corneoscleral shell in an ex vivo bovine globe, suggesting that MRE may provide a useful means to assess the mechanical properties of the eye and its anatomy. Further development of the technique and modeling process will enhance its potential, and further investigations are needed to determine its clinical potential.

Original languageEnglish (US)
Pages (from-to)44-51
Number of pages8
JournalJournal of Magnetic Resonance Imaging
Volume32
Issue number1
DOIs
StatePublished - Jul 2010

Keywords

  • Cornea
  • Eye
  • MR elastography
  • Mechanical properties
  • Sclera

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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    Litwiller, D. V., Lee, S. J., Kolipaka, A., Mariappan, Y. K., Glaser, K. J., Pulido, J. S., & Ehman, R. L. (2010). MR elastography of the ex vivo bovine globe. Journal of Magnetic Resonance Imaging, 32(1), 44-51. https://doi.org/10.1002/jmri.22217