Back to Search
Start Over
Accuracy of high-resolution in vivo micro magnetic resonance imaging for measurements of microstructural and mechanical properties of human distal tibial bone
- Source :
- Journal of Bone and Mineral Research. 25:2039-2050
- Publication Year :
- 2010
- Publisher :
- Wiley, 2010.
-
Abstract
- Micro magnetic resonance imaging (µMRI) is an in vivo imaging method that permits 3D quantification of cortical and trabecular bone microstructure. µMR images can also be used for building microstructural finite element (µFE) models to assess bone stiffness, which highly correlates with bone's resistance to fractures. In order for µMRI-based microstructural and µFE analyses to become standard clinical tools for assessing bone quality, validation with a current gold standard, namely, high-resolution micro computed tomography (µCT), is required. Microstructural measurements of 25 human cadaveric distal tibias were performed for the registered µMR and µCT images, respectively. Next, whole bone stiffness, trabecular bone stiffness, and elastic moduli of cubic subvolumes of trabecular bone in both µMR and µCT images were determined by voxel-based µFE analysis. The bone volume fraction (BV/TV), trabecular number (Tb.N*), trabecular spacing (Tb.Sp*), cortical thickness (Ct.Th), and structure model index (SMI) based on µMRI showed strong correlations with µCT measurements (r2 = 0.67 to 0.97), and bone surface-to-volume ratio (BS/BV), connectivity density (Conn.D), and degree of anisotropy (DA) had significant but moderate correlations (r2 = 0.33 to 0.51). Each of these measurements also contributed to one or many of the µFE-predicted mechanical properties. However, model-independent trabecular thickness (Tb.Th*) based on µMRI had no correlation with the µCT measurement and did not contribute to any mechanical measurement. Furthermore, the whole bone and trabecular bone stiffness based on µMRI were highly correlated with those of µCT images (r2 = 0.86 and 0.96), suggesting that µMRI-based µFE analyses can directly and accurately quantify whole bone mechanical competence. In contrast, the elastic moduli of the µMRI trabecular bone subvolume had significant but only moderate correlations with their gold standards (r2 = 0.40 to 0.58). We conclude that most microstructural and mechanical properties of the distal tibia can be derived efficiently from µMR images and can provide additional information regarding bone quality. © 2010 American Society for Bone and Mineral Research.
- Subjects :
- Male
Materials science
Endocrinology, Diabetes and Metabolism
computer.software_genre
Article
Voxel
medicine
Humans
Orthopedics and Sports Medicine
Tibia
Anisotropy
Aged
Aged, 80 and over
medicine.diagnostic_test
Stiffness
Magnetic resonance imaging
Anatomy
Middle Aged
Magnetic Resonance Imaging
Biomechanical Phenomena
Female
Tomography
medicine.symptom
Cadaveric spasm
computer
Preclinical imaging
Biomedical engineering
Subjects
Details
- ISSN :
- 08840431
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Journal of Bone and Mineral Research
- Accession number :
- edsair.doi.dedup.....197d71a3c7c57fa23ebbcc21fad537b6