In vivo measurement of basilar membrane vibration in the unopened chinchilla cochlea using high frequency ultrasound

Thomas G. Landry, Manohar L. Bance, Jeffrey Leadbetter, Robert B. Adamson, Jeremy A. Brown

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4 Citas (Scopus)

Resumen

The basilar membrane and organ of Corti in the cochlea are essential for sound detection and frequency discrimination in normal hearing. There are currently no methods used for real-time high resolution clinical imaging or vibrometry of these structures. The ability to perform such imaging could aid in the diagnosis of some pathologies and advance understanding of the causes. It is demonstrated that high frequency ultrasound can be used to measure basilar membrane vibrations through the round window of chinchilla cochleas in vivo. The basic vibration characteristics of the basilar membrane agree with previous studies that used other methods, although as expected, the sensitivity of ultrasound was not as high as optical methods. At the best frequency for the recording location, the average vibration velocity amplitude was about 4 mm/s/Pa with stimulus intensity of 50 dB sound pressure level. The displacement noise floor was about 0.4 nm with 256 trial averages (5.12 ms per trial). Although vibration signals were observed, which likely originated from the organ of Corti, the spatial resolution was not adequate to resolve any of the sub-structures. Improvements to the ultrasound probe design may improve resolution and allow the responses of these different structures to be better discriminated.

Idioma originalEnglish
Páginas (desde-hasta)4610-4621
Número de páginas12
PublicaciónJournal of the Acoustical Society of America
Volumen141
N.º6
DOI
EstadoPublished - jun. 1 2017

Nota bibliográfica

Funding Information:
This work was funded by the Atlantic Canada Opportunities Agency (AIF 197819).

Publisher Copyright:
© 2017 Acoustical Society of America.

ASJC Scopus Subject Areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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