1. Articles from Antoine Ramier

    1-2 of 2
    1. Mapping the phase and amplitude of ossicular chain motion using sound-synchronous optical coherence vibrography

      Mapping the phase and amplitude of ossicular chain motion using sound-synchronous optical coherence vibrography

      The sound-driven vibration of the tympanic membrane and ossicular chain of middle-ear bones is fundamental to hearing. Here we show that optical coherence tomography in phase synchrony with a sound stimulus is well suited for volumetric, vibrational imaging of the ossicles and tympanic membrane. This imaging tool — OCT vibrography — provides intuitive motion pictures of the ossicular chain and how they vary with frequency. Using the chinchilla ear as a model, we investigated the vibrational snapshots and phase delays of the manubrium, incus, and stapes over 100 Hz to 15 kHz. The vibrography images reveal a previously undescribed mode of motion ...

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    2. Observation of sound-induced corneal vibrational modes by optical coherence tomography

      Observation of sound-induced corneal vibrational modes by optical coherence tomography

      The mechanical stability of the cornea is critical for maintaining its normal shape and refractive function. Here, we report an observation of the mechanical resonance modes of the cornea excited by sound waves and detected by using phase-sensitive optical coherence tomography. The cornea in bovine eye globes exhibited three resonance modes in a frequency range of 50-400 Hz. The vibration amplitude of the fundamental mode at 80-120 Hz was ~8 µm at a sound pressure level of 100 dB (2 Pa). Vibrography allows the visualization of the radially symmetric profiles of the resonance modes. A dynamic finite-element analysis supports our ...

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    1-2 of 2
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  2. Topics in the News

    1. (2 articles) Harvard University
    2. (2 articles) Seok-Hyun Yun
    3. (1 articles) Massachusetts Eye and Ear Infirmary
    4. (1 articles) University of Maryland
    5. (1 articles) Massachusetts General Hospital
    6. (1 articles) Spanish National Research Council
    7. (1 articles) B. Imran Akca
    8. (1 articles) Susana Marcos
    9. (1 articles) Ernest W. Chang
    10. (1 articles) FDA
    11. (1 articles) Avinger
    12. (1 articles) Axsun Technologies
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