Title :
Non-contact measurement of propagation characteristics in human wrist using pass-through airborne ultrasound
Author :
Hirata, Shinnosuke ; Terashima, K. ; Haritaipan, Lalita ; Hoshiba, Kotaro ; Hachiya, Hiroyuki ; Niimi, Nobuo
Author_Institution :
Dept. of Mech. & Control Eng., Tokyo Inst. of Technol., Tokyo, Japan
Abstract :
The non-contact measurement of the propagation characteristics in the human body using pass-through airborne ultrasound has been proposed. Detection and evaluation of airborne ultrasound passed through the heel have been reported. However, estimation of the speed of sound (SOS) in the heel is difficult due to large attenuation of the pass-through ultrasound. In this paper, airborne ultrasound passed through the wrist is studied. The pass-through ultrasound can be detected by pulse compression using more than 16th-order M-sequence. Attenuation of the pass-through ultrasound or the estimated SOSs in the wrist are different by the transducer position. When the transducers are set at the center of the wrist, attenuation and the SOS are 86.2 dB and 1780 m/s, respectively.
Keywords :
acoustic signal processing; biomedical transducers; biomedical ultrasonics; pulse compression; ultrasonic absorption; ultrasonic propagation; ultrasonic transducers; ultrasonic variables measurement; ultrasonic velocity; heel; human body; human wrist; noncontact measurement; pass-through airborne ultrasound; pass-through ultrasound attenuation; propagation characteristics; pulse compression; sound speed; transducer position; Acoustics; Attenuation; Bones; Transducers; Ultrasonic imaging; Ultrasonic variables measurement; Wrist; non-contact measurement of ultrasonic propagation characteristics; pass-through airborne ultrasound; pulse compression using M-sequence; ultrasonic bone assessment;
Conference_Titel :
Ultrasonics Symposium (IUS), 2014 IEEE International
Conference_Location :
Chicago, IL
DOI :
10.1109/ULTSYM.2014.0345
