Piezoelectric Anisotropy in Water-Saturated Cancellous Bone at an Ultrasound Frequency
| Autor: | Hosokawa, Atsushi |
|---|---|
| Přispěvatelé: | Kobe City College of Technology [Kobe, Japan] |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Forum Acusticum Forum Acusticum, Dec 2020, Lyon, France. pp.2695-2698, ⟨10.48465/fa.2020.0208⟩ |
| DOI: | 10.48465/fa.2020.0208 |
| Popis: | International audience; In recent years, LIPUS (low-intensity pulsed ultrasound) is medically used to accelerate healing of bone fracture. Bone can behave as a piezoelectric material, and the piezoelectric effects in bone can be associated with bone formation. Therefore, the piezoelectric effect under ultrasound irradiation should be elucidated to realize more effective fracture healing. However, in the ultrasound-frequency domain, the piezoelectric properties in bone, particularly, in cancellous bone with a porous trabecular structure, are not yet well investigated. In this study, piezoelectric anisotropy in cancellous bone at an ultrasound frequency was investigated. Piezoelectric signals generated in a cubic specimen (approximately 12 mm on a side) of bovine cancellous bone when an ultrasound wave was irradiated toward each of three orthogonal surfaces were experimentally observed. Bone marrow in the pores was removed, and the spaces were saturated with water. The porosity was approximately 0.7 (70%). The observation of the piezoelectric signals was performed using a piezoelectric cell (PE-cell). The PE-cell, in which the cancellous bone specimen was attached as piezoelectric elements, can corresponded to an ultrasonic receiver. In order to irradiate an ultrasound wave toward three orthogonal surfaces, the direction of attaching the cancellous bone specimen was changed. A burst ultrasound wave at 2 MHz was radiated, and the output signal from the PE-cell, namely the piezoelectric signal generated in the cancellous bone specimen, was observed. The piezoelectric signals could be observed in all three ultrasound directions. The piezoelectric amplitude was larger as the trabecular orientation in the irradiation direction was stronger. It is known that the ultrasound propagation can be largely affected by the trabecular orientation, and it was considered that the change of the ultrasound wave could affect the piezoelectric signal. It was concluded that cancellous bone had piezoelectric anisotropy which could be associated with the trabecular orientation. |
| Databáze: | OpenAIRE |
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