High-Speed Holographic Shape and Full-Field Displacement Measurements of the Tympanic Membrane in Normal and Experimentally Simulated Pathological Ears
Loading...
Date
2019-07-13
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
To improve the understanding of the middle-ear hearing mechanism and assist in the
diagnosis of middle-ear diseases, we are developing a high-speed digital holographic (HDH) system
to measure the shape and acoustically-induced transient displacements of the tympanic membrane
(TM). In this paper, we performed measurements on cadaveric human ears with simulated common
middle-ear pathologies. The frequency response function (FRF) of the normalized displacement by the
stimulus (sound pressure) at each measured pixel point of the entire TM surface was calculated and
the complex modal indicator function (CMIF) of the middle-ear system based on FRFs of the entire TM
surface motions was used to differentiate different middle-ear pathologies. We also observed changes
in the TM shape and the surface motion pattern before and after various middle-ear manipulations.
The observations of distinguishable TM shapes and motion patterns in both time and frequency
domains between normal and experimentally simulated pathological ears support the development
of a quantitative clinical holography-based apparatus for diagnosing middle-ear pathologies.
Description
Subject(s)
frequency transfer functions, high-speed digital holography, human tympanic membrane, middle-ear pathologies