Interacoustics Titan Instructions For Use Manual page 69

Titan Instructions for Use - EN
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Sanford et al., (2009). Sound-conduction effects on distortion-product otoacoustic emission screening
outcomes in newborn infants: Test performance of wideband acoustic transfer functions and 1-kHz
tympanometry. Ear & Hearing, 30, 635-652.
The following numerical information is displayed:
- The equivalent ear canal volume
- The lowest available resonance frequency at peak pressure.
The tympanogram found at this resonance frequency can be
interesting for differentiating between some pathologies (for
example to distinguish between a flaccid eardrum and a
discontinuity of the ossicular chain)
- Peak pressure as found in the frequency averaged
tympanogram
- The peak compliance for both tympanograms at 226 Hz (in ml)
and 1000 Hz (in mmho)
The Tympanograms tab can display up to 3 tympanograms
retrieved from the 3D measurement On top of tympanograms at
traditional frequencies and the resonance frequency, a Wide Band
Tympanogram can be displayed. This WB tympanogram is the
average curve in a range of the measurement. For babies under
the age of 6 months the curves from 800 to 2000 Hz are averaged.
For older children and adults the average is taken from 375 to 2000
Hz. It has been shown that WB tympanograms perform better than
1000 Hz tympanograms in explaining why an OAE screening has
resulted in a refer, particularly in infants.
The WB tympanogram is influenced less by noise and offers more
reliable information than the traditional frequencies of 1000 Hz in
infants and 226 Hz for older children and adults. Sanford et al.
recommend considering the implementation of the WB
tympanogram in the follow up diagnostics of neonatal screening
programs.
Using the right mouse click in the tympanogram window gives a
pop up window. The following options are available:
- Show Y to show the acoustic admittance
- Show G to show the acoustic conductance (the real part of the
admittance vector)
- Show B to show the acoustic susceptance (the imaginary part of
the admittance vector)
- Show Phase to show the phase (the angle of the admittance
vector)
- 226Hz to display the 226 Hz tympanogram from the 3D
Tympanometry measure
- 678Hz to display the 678 Hz tympanogram from the 3D
Tympanometry measure
- 800Hz to display the 800 Hz tympanogram from the 3D
Tympanometry measure
- 1000Hz to display the 1000 Hz tympanogram from the 3D
Tympanometry measure
- Resonance Frequency to display the tympanogram from the 3D
Tympanometry measure that is found at the lowest resonance
frequency at peak pressure
- Adult (Avrg 375Hz to 2000Hz) to display the averaged
tympanogram between 375 and 2000 Hz which is only available
when the protocol uses calibration values valid for 6 months and
older
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