Abstract
Conventional techniques for the measurement of the acoustic admittance of the middle ear are heavily dependent upon the mobility of the most flaccid parts of the tympanic membrane and relatively insensitive to abnormalities of the ossicular chain. This paper describes a method which has been developed to characterize the vibratory properties of the tympanic membrane and the ossicular chain separately. The technique is based on the analysis of trajectories traced by the middle-ear admittance phasor as either the external ear canal pressure, or the stapedius muscle tension, is modified. Consequently, the tympanic membrane and ossicular chain are each characterised by means of a natural frequency and damping ratio. Normative data are presented from 68 ears screened for middle-ear disease. The results indicate that the two measures are each relatively consistent between subjects, yet the two measures within subjects are independent of one another. Thus they provide tractable measures of middle-ear status.
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