Doppler optical coherence microscopy and tomography applied to inner ear mechanics

Scott Page, Roozbeh Ghaffari, Dennis M. Freeman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

While it is clear that cochlear traveling waves underlie the extraordinary sensitivity, frequency selectivity, and dynamic range of mammalian hearing, the underlying micromechanical mechanisms remain unresolved. Recent advances in low coherence measurement techniques show promise over traditional laser Doppler vibrometry and video microscopy, which are limited by low reflectivities of cochlear structures and restricted optical access. Doppler optical coherence tomography (DOCT) and Doppler optical coherence microscopy (DOCM) both utilize a broadband source to limit constructive interference of scattered light to a small axial depth called a coherence gate. The coherence gate can be swept axially to image and measure sub-nanometer motions of cochlear structures throughout the cochlear partition. The coherence gate of DOCT is generally narrower than the confocal gate of the focusing optics, enabling increased axial resolution (typically 15 μm) within optical sections of the cochlear partition. DOCM, frequently implemented in the time domain, centers the coherence gate on the focal plane, achieving enhanced lateral and axial resolution when the confocal gate is narrower than the coherence gate. We compare these two complementary systems and demonstrate their utility in studying cellular and micromechanical mechanisms involved in mammalian hearing.

Original languageEnglish (US)
Title of host publicationMechanics of Hearing
Subtitle of host publicationProtein to Perception - Proceedings of the 12th International Workshop on the Mechanics of Hearing
EditorsDavid P. Corey, K. Domenica Karavitaki
PublisherAmerican Institute of Physics Inc.
Volume1703
ISBN (Electronic)9780735413504
DOIs
StatePublished - Dec 31 2015
Event12th International Workshop on the Mechanics of Hearing: Protein to Perception - Cape Sounio, Greece
Duration: Jun 23 2014Jun 29 2014

Other

Other12th International Workshop on the Mechanics of Hearing: Protein to Perception
CountryGreece
CityCape Sounio
Period6/23/146/29/14

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Page, S., Ghaffari, R., & Freeman, D. M. (2015). Doppler optical coherence microscopy and tomography applied to inner ear mechanics. In D. P. Corey, & K. D. Karavitaki (Eds.), Mechanics of Hearing: Protein to Perception - Proceedings of the 12th International Workshop on the Mechanics of Hearing (Vol. 1703). [040002] American Institute of Physics Inc.. https://doi.org/10.1063/1.4939336