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Article Dans Une Revue Ultrasonic Imaging Année : 2017

Three-dimensional Simulation of Quantitative Ultrasound in Cancellous Bone using the Echographic Response of a Metallic Pin

Résumé

Degenerative discopathy is a common pathology which may require spine surgery. A metallic cylindrical pin is inserted into the vertebral body to maintain soft tissues and may be used as a reflector of ultrasonic wave to estimate bone density. The first aim of this paper is to validate a 3D model to simulate the ultrasonic propagation in a trabecular bone sample in which a metallic pin has been inserted. We also aim at determining the effect of changes of bone volume fraction (BV/TV) and of positioning errors on the quantitative ultrasound (QUS) parameters in this specific configuration. The approach consists in coupling finite difference time domain simulation with X-ray microcomputed tomography. The correlation coefficient between experimental and simulated speed of sound (SOS) (respectively broadband ultrasonic attenuation (BUA)) was equal to 0.90 (respectively 0.55). The results show a significant correlation of SOS with BV/TV (R = 0.82), while BUA values exhibit a non-linear behavior versus BV/TV. The orientation of the pin should be controlled with an accuracy of around 1° in order to obtain accurate results. The results indicate that using the ultrasonic wave reflected by a pin has a potential to estimate the bone density. SOS is more reliable than BUA due its lower sensitivity to the tilt angle.
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Dates et versions

hal-01785947 , version 1 (04-05-2018)

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Yoshiki Nagatani, Séraphin Guipieri, Vu-Hieu Nguyen, Christine Chappard, Didier Geiger, et al.. Three-dimensional Simulation of Quantitative Ultrasound in Cancellous Bone using the Echographic Response of a Metallic Pin. Ultrasonic Imaging, 2017, 39 (5), pp.295-312. ⟨10.1177/0161734617698648⟩. ⟨hal-01785947⟩
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