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In vivo multifrequency magnetic resonance elastography of the human intervertebral disk.
MedLine Citation:
PMID:  25359242     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: To test in vivo magnetic resonance elastography (MRE) of the human intervertebral disk (IVD).
METHODS: The feasibility of MRE in IVD was demonstrated in ex vivo bovine disks. Sixteen asymptomatic volunteers underwent multifrequency MRE of the lumbar spine (IVD L3/4 and L4/5, n = 32) using a posterior plate transducer connected to a loudspeaker and operated at five frequencies from 50 to 70 Hz. Full wave field data were acquired in 10 transverse slices of 2 × 2 × 2 mm(3) resolution. High-resolution maps of magnitude |G*| and phase angle φ of complex shear modulus G* were generated by multifrequency dual elasto visco (MDEV) inversion. Disk morphology was assessed by the Pfirrmann score (Pf).
RESULTS: Morphological Pf was 1 in 25, 2 in 3, and 3 in 4 disks. |G*| decreased with Pf by a Pearson's linear correlation coefficient of R = -0.592 (P = 0.0004), while φ remained unchanged. Group mean mechanical parameters for Pf = 1 to 3 were |G*| = 6.51 ± 1.27, 5.29 ± 0.95, 4.03 ± 0.99 kPa, and φ = 1.190 ± 0.181, 1.170 ± 0.156, 1.088 ± 0.084 rad, respectively (p[Pf1-Pf3] < 0.001). The variability of mechanical parameters in one volunteer including diurnal changes was approximately 11%.
CONCLUSION: Multifrequency MRE with MDEV inversion allows measurement of in vivo mechanical properties of IVDs and may provide additional information in disc degeneration beyond standard morphological changes. Magn Reson Med, 2014. © 2014 Wiley Periodicals, Inc.
Authors:
Kaspar-Josche Streitberger; Gerd Diederichs; Jing Guo; Andreas Fehlner; Bernd Hamm; Jürgen Braun; Ingolf Sack
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-10-30
Journal Detail:
Title:  Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine     Volume:  -     ISSN:  1522-2594     ISO Abbreviation:  Magn Reson Med     Publication Date:  2014 Oct 
Date Detail:
Created Date:  2014-10-31     Completed Date:  -     Revised Date:  2014-11-2    
Medline Journal Info:
Nlm Unique ID:  8505245     Medline TA:  Magn Reson Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2014 Wiley Periodicals, Inc.
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