Interacoustics Titan Instructions For Use Manual page 70

Titan Instructions for Use - EN
- Child (Avrg 800Hz to 2000Hz) to display the averaged
tympanogram between 800 and 2000 Hz which is only available
when the protocol uses calibration values valid up to an age of 6
months
- Show compensated to show the tympanogram baseline
compensated. When measuring tympanograms with higher probe
tone frequencies, it is common to have the low pressure tail of
the tympanogram, much lower than the high pressure tail. To see
those tympanograms completely, it is recommended to view them
non-compensated
Up and down buttons to scale the y-axis of the tympanogram.
The table with measurement values. Here you will find
- V or Volume, the equivalent ear canal volume
- C or Compliance, the peak compensated static acoustic
admittance, or in other words: When the tympanogram is shown
baseline compensated, C is the compliance value at the peak. A
peak compliance (or peak absorbance) for the averaged
tympanogram is not calculated
- P or Pressure, the pressure at which the peak (or highest
compliance) is detected
- G or Gradient. If it is chosen to show gradient in pressure values,
it gives the tympanogram width at half the height of the peak
compensated static acoustic admittance. If it is chosen to show
gradient as a compliance value it gives the average of the two
compensated admittance values which are 50 daPa away from
the peak pressure. Gradient is not calculated for averaged tymps
The Absorbances tab shows the absorbance at ambient pressure
and/or at peak pressure as a function of frequency, retrieved from
the 3D measurement. By matching the curve to a normative data
set one can obtain a quick impression of the middle ear status.
Using right mouse click in the tympanogram window gives a pop up
window. The following options are available
- Overlay peak pressure curve which overlays the absorbance
curve at the peak pressure with the curve at ambient pressure
- Norm Data 10% - 90% to show the interval of the norm data that
includes 10% to 90% of the normal population
- Norm Data 5% - 95% to show the interval of the norm data that
includes 5% to 95% of the normal population
These sketched examples show how an absorbance
measurement could look for certain pathological cases. These
examples can be resized by dragging the mouse up or down
between the examples and the absorbance graph. When an
example is selected it is displayed with the measurement.
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