Stereo microscope based OCT system capable of subnanometer vibrometry in the middle ear

Wihan Kim; Sangmin Kim; John S. Oghalai; Brian E. Applegate

doi:10.1117/12.2527222

19 July 2019 Stereo microscope based OCT system capable of subnanometer vibrometry in the middle ear

Wihan Kim, Sangmin Kim, John S. Oghalai, Brian E. Applegate

Proceedings Volume 11078, Optical Coherence Imaging Techniques and Imaging in Scattering Media III; 110780G (2019) https://doi.org/10.1117/12.2527222
Event: European Conferences on Biomedical Optics, 2019, Munich, Germany

Abstract

A principal tool for the visual inspection of the middle ear in the hearing clinic is the surgical stereo-microscope. We have developed a compact accessory for the surgical microscope that enables volumetric optical coherence tomography (OCT) imaging of the middle ear as well as functional vibratory imaging with subnanometer sensitivity. The sensitivity to vibration is achieved by careful engineering of the microscope attachment and frequency-domain processing. The microscope attachment integrates the entire OCT interferometer onto a custom aluminum base that mounts directly to the accessory area at the foot of most surgical microscopes. This approach is effective at removing high-frequency phase-noise, thus enabling near shot-noise limited sensitivity above ~2 kHz even though the OCT system is suspended above the patient by a boom arm. We analyze the vibratory response in the frequency domain, hence our ability to measure vibrations in the tympanic membrane and ossicles is near the shot-noise limit. As a demonstration of this system we have recorded in vivo volumetric images of a healthy human patient as well as the vibratory response at the tympanic membrane down to the hearing threshold. We also show that it is possible to use time averaging to drive the noise floor down below 2 pm which allowed us to make the first measure of distortion product otoacoustic emissions (DPOAE) using OCT. Finally, the system can easily be taken on and off of the surgical microscope and when in use does not impinge on the normal view through the surgical microscope.

Citation Download Citation

Wihan Kim, Sangmin Kim, John S. Oghalai, and Brian E. Applegate "Stereo microscope based OCT system capable of subnanometer vibrometry in the middle ear ", Proc. SPIE 11078, Optical Coherence Imaging Techniques and Imaging in Scattering Media III, 110780G (19 July 2019); https://doi.org/10.1117/12.2527222

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
3 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Optical coherence tomography

Ear

Microscopes

Imaging systems

Vibrometry

Distortion

Diagnostics

Show All Keywords

Keywords/Phrases

Search In:

Publication Years