Low intensity pulsed ultrasound can shorten the healing time of a bone fracture; however, the present technique does not seem not to consider the complicated ultrasound propagation in the body with bone. In this study, the time reversal technique was used to effectively converge ultrasound in the bone part. A three-dimensional distal radius model was constructed by using a high resolution-peripheral quantitative CT data (spatial resolution; 61 μm). In the simulation using Finite Difference Time Domain method, one cycle of sinusoidal ultrasound wave (1 MHz) with Hanning window was transmitted from a virtual fracture point (1 mm3). The model was surrounded by water. The propagating ultrasound waves were observed by two ring shape array transducers, coaxially placed along the bone model at the distance of 30 mm from the fracture point. Then, time reversal waves were radiated from the array transducers, considering the phase shifts and amplitudes of the observed waves in the previous simulation. The time reversal waves successfully converged near the initial virtual fracture part, telling the usefulness of the technique. In the radial-tangential plane including the point, the converged area (−3dB of maximum stress value) was 42.8 mm2.
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September 2018
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September 01 2018
Study on the ultrasonic wave convergence in the medium with bone
Masaya Saeki;
Masaya Saeki
Dept. of Elec. and Electronics Eng., Doshisha Univ., 1-3 Tatara-Miyakodani, Kyotanabe-shi, Kyoto 610-0321, Japan, [email protected]
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Leslie V. Bustamante Diaz;
Leslie V. Bustamante Diaz
Dept. of Elec. and Electronics Eng., Doshisha Univ., 1-3 Tatara-Miyakodani, Kyotanabe-shi, Kyoto 610-0321, Japan, [email protected]
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Yoshiki Nagatani;
Yoshiki Nagatani
Electronics Eng., Kobe City College of Technol., Kobe, Hyogo, Japan
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Ko Chiba;
Ko Chiba
School of Biomedical Sci., Nagasaki Univ., Nagasaki, Japan
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Isao Mano;
Isao Mano
Dept. of Elec. and Electronics Eng., Doshisha Univ., Joyo, Japan
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Mami Matsukawa
Mami Matsukawa
Dept. of Elec. and Electronics Eng., Doshisha Univ., Kyotanabe, Japan
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J. Acoust. Soc. Am. 144, 1853 (2018)
Citation
Masaya Saeki, Leslie V. Bustamante Diaz, Yoshiki Nagatani, Ko Chiba, Isao Mano, Mami Matsukawa; Study on the ultrasonic wave convergence in the medium with bone. J. Acoust. Soc. Am. 1 September 2018; 144 (3_Supplement): 1853. https://doi.org/10.1121/1.5068154
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