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Kyoto, Japan

Mano I.,Doshisha University | Horii K.,Oyo Electrical Co | Fujita F.,Doshisha University | Nagatani Y.,Kobe City College of Technology | And 2 more authors.
Japanese Journal of Applied Physics | Year: 2014

An ultrasonic system is good for the evaluation of children because its noninvasiveness. The ultrasonic bone measurement system LD-100 has been developed on the basis of the principle of the fast and slow wave phenomenon in the wrist bone. In the measurement of small bones such as those of children, there are some problems due to the influences of circumferential waves on the fast and slow waves. When the diameters of the focused transducers were small, the appearance of the circumferential wave around the cortical bone became late, and it could avoid one of the influences of the circumferential waves. © 2014 The Japan Society of Applied Physics. Source


Mano I.,Doshisha University | Horii K.,Oyo Electrical Co | Matsukawa M.,Doshisha University | Otani T.,Doshisha University
Japanese Journal of Applied Physics | Year: 2013

We have tried in vivo imaging of the distal forearm bone using ultrasonic echo waves. The obtained ultrasonic echo images were compared with X-ray computed tomography (CT) images. In the case of vertical incidence of an ultrasonic wave to the cortical bone surface, not only the outer and inner boundaries of the near side of the cortical bone but also the inner and outer boundaries of the far side of the cortical bone were identified. The thicknesses of the cortical bone and cancellous bone calculated using the echo waves approximately agreed with those determined from X-ray CT images. © 2013 The Japan Society of Applied Physics. Source


Mano I.,Doshisha University | Horii K.,Oyo Electrical Co | Matsukawa M.,Doshisha University | Otani T.,Doshisha University
Japanese Journal of Applied Physics | Year: 2015

Ultrasonic transmitted waves were obtained in an in vitro swine distal ulna specimen, which mimics a human distal radius, that consists of interconnected cortical bone and cancellous bone. The transmitted waveforms appeared similar to the fast waves, slow waves, and overlapping fast and slow waves measured in the specimen after removing the surface cortical bone (only cancellous bone). In addition, the circumferential waves in the cortical bone and water did not affect the fast and slow waves. This suggests that the fast-and-slow-wave phenomenon can be observed in an in vivo human distal radius. © 2015 The Japan Society of Applied Physics. Source


Mano I.,Doshisha University | Horii K.,Oyo Electrical Co | Hagino H.,Tottori University | Miki T.,Izumiotsu Municipal Hospital | And 2 more authors.
Journal of Medical Ultrasonics | Year: 2015

Purpose: To verify the measurement of cortical bone thickness at the distal radius in vivo using an ultrasonic method. Methods: The method for estimating cortical bone thickness was derived from experiments with in vitro bovine specimens. Propagation time of echo waves and propagation time of slow waves were used for the estimation. The outside diameter of cortical bone and the cortical bone thickness at the distal 5.5 % site of radius were measured with the new ultrasonic bone measurement system, and the results were compared with X-ray pQCT clinical measurements. Results: There was a high positive correlation (r: 0.76) between the cortical bone thickness measured by the new ultrasonic system and the X-ray pQCT results. Conclusion: We will be able to measure not only cancellous bone density but also cortical bone thickness in vivo using ultrasonic waves (without X-ray) safely and repeatedly. © 2015, The Japan Society of Ultrasonics in Medicine. Source


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OYO Electrical CO. and Aitos Inc. | Date: 2009-01-27

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