Feasibility of MR elastography of the intervertebral disc

Ephraim I. Ben-Abraham, Jun Chen, Joel P. Felmlee, Phil Rossman, Armando Manduca, Kai Nan An, Richard L. Ehman

研究成果: Article同行評審

15 引文 斯高帕斯(Scopus)

摘要

Low back pain (LBP) is a costly and widely prevalent health disorder in the U.S. One of the most common causes of LBP is degenerative disc disease (DDD). There are many imaging techniques to characterize disc degeneration; however, there is no way to directly assess the material properties of the intervertebral disc (IVD) within the intact spine. Magnetic resonance elastography (MRE) is an MRI-based technique for non-invasively mapping the mechanical properties of tissues in vivo. The purpose of this study was to investigate the feasibility of using MRE to detect shear wave propagation in and determine the shear stiffness of an axial cross-section of an ex vivo baboon IVD, and compare with shear displacements from a finite element model of an IVD motion segment in response to harmonic shear vibration. MRE was performed on two baboon lumbar spine motion segments (L3–L4) with the posterior elements removed at a range of frequencies (1000–1500 Hz) using a standard clinical 1.5 T MR scanner. Propagating waves were visualized in an axial cross-section of the baboon IVDs in all three motion-encoding directions, which resembled wave patterns predicted using finite element modeling. The baboon nucleus pulposus showed an average shear stiffness of 79 ± 15 kPa at 1000 Hz. These results suggest that MRE is capable of visualizing shear wave propagation in the IVD, assessing the stiffness of the nucleus of the IVD, and can differentiate the nucleus and annulus regions.

原文English
頁(從 - 到)132-137
頁數6
期刊Magnetic Resonance Imaging
39
DOIs
出版狀態Published - 2017 6月 1

All Science Journal Classification (ASJC) codes

  • 生物物理學
  • 生物醫學工程
  • 放射學、核子醫學和影像學

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