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Variability of Child Rib Bone Hounsfield Units using in vivo Computed Tomography

Communication avec acte
Author
SIDELKEIR, Zaki
99538 Laboratoire de biomécanique [LBM]
BADINA, Alina
BERMOND, François
222174 Laboratoire de Biomécanique et Mécanique des Chocs [LBMC UMR T9406]
MITTON, David
222174 Laboratoire de Biomécanique et Mécanique des Chocs [LBMC UMR T9406]
ccSKALLI, Wafa
99538 Laboratoire de biomécanique [LBM]
ccSANDOZ, Baptiste
99538 Laboratoire de biomécanique [LBM]

URI
http://hdl.handle.net/10985/8557
Date
2013

Abstract

The variability assessment of the rib bone mechanical properties during the growth process is still missing. These properties could not be obtained in vivo on children. Relationships have been obtained between Hounsfield Units from computed tomography (CT) and mechanical properties (e.g. for the cortical bone on adults). As a first step for investigation of the mechanical properties of child ribs, the aim of this study was to determine the Hounsfield Units variation of child ribs from CT‐scan data, by rib level, along the rib and within the rib sections. Twenty‐seven right ribs of levels 4, 6 and 9 were processed from 11 thoracic CT scans of children without bone lesions aged between 1 and 10 years. A first set of 10 equidistributed cross‐sections normal to the rib midline were extracted. Sixteen equally distributed elements defined 4 areas into the cortical band: internal, external, caudal and cranial. Within the rib sections, Hounsfield Units were found significantly higher in internal and external areas than in caudal and cranial. In a further step using calibrated CT scans, it would be possible to derive the mechanical properties of in vivo child ribs using bone density correlation with Hounsfield Units.

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