Sequential motion of the ossicular chain measured by laser Doppler vibrometry |
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| Authors: | Yasuomi Kunimoto Kensaku Hasegawa Shiro Arii Hideyuki Kataoka Hiroaki Yazama Junko Kuya |
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| Institution: | 1. Department of Otolaryngology, Head and Neck Surgery, Faculty of Medicine, Tottori University, Yonago, Japan;2. Department of Information and Knowledge Engineering, Graduate School of Engineering, Tottori University, Tottori, Japan |
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| Abstract: | Objective: In order to help a surgeon make the best decision, a more objective method of measuring ossicular motion is required.Methods: A laser Doppler vibrometer was mounted on a surgical microscope. To measure ossicular chain vibrations, eight patients with cochlear implants were investigated. To assess the motions of the ossicular chain, velocities at five points were measured with tonal stimuli of 1 and 3?kHz, which yielded reproducible results. The sequential amplitude change at each point was calculated with phase shifting from the tonal stimulus. Motion of the ossicular chain was visualized from the averaged results using the graphics application.Results: The head of the malleus and the body of the incus showed synchronized movement as one unit. In contrast, the stapes (incudostapedial joint and posterior crus) moved synchronously in opposite phase to the malleus and incus. The amplitudes at 1?kHz were almost twice those at 3?kHz.Conclusions: Our results show that the malleus and incus unit and the stapes move with a phase difference. |
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| Keywords: | Acoustic energy laser Doppler vibrometry frequency specificity |
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