The proposal develops a hand-held otoscope that uses optical coherence tomography (OCT) to image the tympanic membrane and ossicles behind an intact tympanic membrane. The system is based on spectral Fourier-domain OCT and can measure vibrations of the ossicles (malleus, incus, stapes) of the middle ear on the scale of nm to ?m amplitude.
In Aim 1 we construct and develop a protype of the otoscope testing the performance of the hardware and middle ear analysis software using phantom objects with known vibration.
In Aim 2 we use the prototype otoscope to study human temporal bone specimens to investigate ossicular chain 'disorders'by experimental ossicle fixations and disarticulations.
Aim 3 is a pilot clinical use in recruited human subjects with normal or pathological middle ear function as assessed by conventional methods. This new otoscope will greatly improve the non-invasive diagnosis of conductive hearing loss. Current practice relies on either indirect assessment of ossicle movement by measuring compliance of the tympanic membrane to sound or pressure, or direct examination after surgically cutting the tympanic membrane to gain access to the ossicles. The OCT otoscope can directly image and measure vibrations noninvasively, without cutting the tympanic membrane. The project will yield an innovative, non-invasive diagnostic instrument capable of localizing the site of conductive hearing loss behind an intact tympanic membrane. The OCT otoscope will facilitate a better understanding of sound conduction in normal, diseased and reconstructed middle ears, allowing clinicians to make more precise pre-surgical diagnosis, to analyze more informatively post-surgical results, and ultimately to develop more effective treatments for patients with conductive hearing loss.

Public Health Relevance

This proposal will develop a hand-held otoscope that can image the ossicles of the middle ear and measure nm-to-mm amplitudes of vibration, while viewing through the intact tympanic membrane. The device would allow noninvasive clinical assessment of conductive hearing loss.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Research Project (R01)
Project #
1R01DC011796-01A1
Application #
8496317
Study Section
Special Emphasis Panel (ZDC1-SRB-L (46))
Program Officer
Watson, Bracie
Project Start
2013-05-01
Project End
2017-04-30
Budget Start
2013-05-01
Budget End
2014-04-30
Support Year
1
Fiscal Year
2013
Total Cost
$478,304
Indirect Cost
$152,218
Name
Oregon Health and Science University
Department
Biomedical Engineering
Type
Schools of Medicine
DUNS #
096997515
City
Portland
State
OR
Country
United States
Zip Code
97239