By Torkel B. Brismar, Lubos Budinsky (auth.), Sharmila Majumdar Ph.D., Brian K. Bay Ph.D. (eds.)
The examine of bone microarchitecture is thriving due to a contemporary shift in viewpoint that has taken researchers past using bone mineral density because the basic resource of knowledge approximately definite concerns relating to bone. within the region of osteoporosis and skeletal alterations, bone mineral density (BMD) is time-honored for screening, tracking and assessing healing efficacy, and but, it really is at the moment approved that BMD doesn't totally clarify the pathogenesis of osteoporosis, the method of getting older, nor mechanisms of healing efficacy. during this context, the examine of trabecular microarchitecture has a lot to contribute.
The rising box of trabecular microarchitecture, even if, is diversified, inter-disciplinary and encompasses many various imaging modalities. This quantity represents a compilation of papers from world-renowned researchers, reflecting the most up-tp-date learn within the zone of noninvasive overview of trabecular microcarchitecture. This assorted learn applies refined imaging instruments to questions of bone biomechanics at either the elemental technology and scientific degrees. The authors' works diversity from overview articles and learn articles to works in development. Taken jointly, they provide a foray into the "state of the paintings" of investigating bone at its most simple degrees
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Extra resources for Noninvasive Assessment of Trabecular Bone Architecture and the Competence of Bone
Van Rietbergen, D. Ulrich, 1. Kabel and P. Ruegsegger, Estimates in normal versus osteoportic bone, Proc. 14th Europ. Soc. Biomat. 14, OST13 (1998). 38. G. Yang, J. Kabel, B. van Rietbergen, A. Odgaard, R. Huiskes and S. C. Cowin, The anisotropic Hooke's law for cancellous bone and wood, J. Elasticity 53,125-146 (1999). 39. A. Odgaard, J. Kabel, B. van Rietbergen, M. Dalstra and R. Huiskes, Fabric and elastic principal directions of cancellous bone are closely related, 1. Biomech .. 30,487-495 (1997).
_--! 1 +-<~---r-----'------! 5D from MRI (500 ~m) b a Figure 5. SD) (b). Th with the plate model gives quite an accurate average. Sp, indicating there is little independent information gained by the calculation with the MIL method. It seems that almost all trabeculae are depicted with one voxel thickness owing to the partial volume effect. The testlines of the MIL methods are then merely counting the individual voxels again, yielding a high correlation with BV/TV. The direct indices, however, really measure metric distances in the structure or in the background of the structure directly, and are determined by BV/TV by about 70%.
The resolution cannot be arbitrarily increased in MR imaging because 'of signal-to-noise considerations and measurement time, which should not exceed 10 to 20 minutes per scan . • Magnetic Resonance Science Center, 1 Irving Street, University of California, San Francisco, Ca. 94143-1290, USA Noninvasive Assessment of Trabecular Bone Architecture and the Competence of Bone Edited by Majumdar & Bay, Kluwer Academic/Plenum Publishers, New York, 2001. 37 38 A. Laib et al. Sp). While thickness seems hardly recoverable for the given in vivo resolutions, trabecular spacing (on the order of 1000 /lm) still makes the determination of number and separation possible.