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A New Method To Determine Volumetric Bone Mineral Density From Bi-Planar Dual Energy Radiographs Using A Finite Element Model: An Ex-Vivo Study

Article dans une revue avec comité de lecture
Author
CHOISNE, Julie
1001017 Institut de Biomécanique Humaine Georges Charpak [IBHGC]
TRAVERT, Christophe
1001017 Institut de Biomécanique Humaine Georges Charpak [IBHGC]
VALIADIS, Jean-Marc
1001017 Institut de Biomécanique Humaine Georges Charpak [IBHGC]
FOLLET, Hélène
303623 Institut National de la Santé et de la Recherche Médicale [INSERM]
ccSKALLI, Wafa
1001017 Institut de Biomécanique Humaine Georges Charpak [IBHGC]

URI
http://hdl.handle.net/10985/20598
DOI
10.1142/s0218957717500038
Date
2017
Journal
Journal of Musculoskeletal Research

Abstract

Finite element models (FEMs) derived from QCT-scans were developed to evaluate vertebral strength but QCT scanners limitations are restrictive for routine osteoporotic diagnosis. A new approach considers using bi-planar dual energy (BP2E) X-rays absorptiometry to build vertebral FEM. The purpose was to propose a FEM based on BP2E absorptiometry and to compare the vertebral strength predicted from this model to a QCT-based FEM. About 46 vertebrae were QCT scanned and imaged with BP2E X-rays. Subject-specific vertebral geometry and bone material properties were obtained from both medical imaging techniques to build FEM for each vertebra. Vertebral body volumetric bone mineral density (vBMD) distribution and vertebral strength prediction from the BP2E-based FEM and the QCT-based FEM were compared. A statistical error of 7[Formula: see text]mg/cm3 with a RMSE of 9.6% and a [Formula: see text] of 0.83 were found in the vBMD distribution differences between the BP2E-based and qCT-based FEM. The average vertebral strength was 3321[Formula: see text][Formula: see text] and 3768[Formula: see text][Formula: see text] for the qCT-based and BP2E-based FEM, respectively, with a RMSE of 641[Formula: see text]N and [Formula: see text] of 0.92. This method was developed to estimate vBMD distribution in lumbar vertebrae from a pair of 2D-BMD images and demonstrated to be accurate to personalize the mechanical properties in vitro.

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