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Structural and mechanical parameters of trabecular bone estimated from in vivo high‐resolution magnetic resonance images at 3 tesla field strength
Author(s) -
Wald Michael Jeffrey,
Magland Jeremy Franklin,
Rajapakse Chamith Sudesh,
Wehrli Felix Werner
Publication year - 2010
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.22158
Subject(s) - magnetic resonance imaging , high resolution , nuclear magnetic resonance , field strength , materials science , in vivo , magnetic field , trabecular bone , field (mathematics) , resolution (logic) , magnetic resonance microscopy , biomedical engineering , physics , medicine , radiology , computer science , spin echo , pathology , geology , osteoporosis , mathematics , biology , artificial intelligence , remote sensing , microbiology and biotechnology , quantum mechanics , pure mathematics
Purpose: To evaluate the performance of a new 3 Tesla (T) high‐resolution trabecular bone (TB) imaging technique at two resolution regimens in terms of serial reproducibility and sensitivity. Materials and Methods: The left distal tibial metaphysis of seven healthy volunteers was imaged at three time‐points using a FLASE (fast large‐angle spin‐echo) pulse sequence at 137 × 137 × 410 μm 3 and (160 μm) 3 voxel sizes. Image artifacts, motion degradation, and serial image volume misalignments were controlled to maximize reproducibility of image‐derived measures of scale, topology, orientation in terms of structural anisotropy, and finite‐element derived Young's and shear moduli. Coefficients of variation (CV) and intraclass correlation coefficients (ICC) for structural and mechanical parameters were evaluated as measures of reproducibility and reliability. The ability of structural and mechanical parameters to distinguish between subjects was tested by analysis of variance. Results: Reproducibility was generally higher in the anisotropic data (CVs 1–5% versus 1–9% for isotropic images). Anisotropic voxel size yielded greater measurement reliability (ICCs 0.75–0.99, mean = 0.92 versus 0.62–0.99, mean = 0.86) and better discrimination of the seven subjects (75% versus 50% of the possible comparisons were significantly different [ P < 0.05]) except for measures of structural anisotropy and topology. Isotropic resolution improved detection of structural orientation and permitted visualization of small perforations in longitudinal trabecular plates not detected at anisotropic resolution. Conclusion: Improved image acquisition and processing techniques enhance reproducibility of structural and mechanical parameters derived from high‐resolution MRI of metaphyseal bone in the distal tibia. J. Magn. Reson. Imaging 2010;31:1157–1168. © 2010 Wiley‐Liss, Inc.