App. 1.5.2 Conductance, G; App. 1.5.3 B/G Viewing Of Tympanograms - Madsen zodiac Reference Manual

Positive Susceptance
If a major portion of the probe tone energy flows through the
The ear is in this case stiffness controlled.
This is true when the probe tone frequency is less than the resonance frequency of the ear.
Negative Susceptance
If a major portion of the probe tone energy flows through the
is in this case
This is true when the probe tone frequency is greater than the resonance frequency of the ear.
Zero Susceptance
If equal amounts of probe tone energy flow through the
is zero. The ear is in this case neither stiffness nor
as the resonance frequency of the ear.
Baseline compensation
In order to quantify the middle ear
achieved through subtraction of the ear canal
The tympanic membrane is tensioned with high air pressure so that the probe tone reflects off the tensed tympanic mem-
brane, and accordingly a negligible portion of the probe tone is admitted into the middle ear.
At high pressures, we only measure the
membrane, resulting in the ear canal
element in this enclosed air is negligible. The value of the notch in the
ined from the corresponding value on the vertical axis, and the relation of the probe tone frequency to the ear resonance
frequency can be estimated according to the above description.
App. 1.5.2 Conductance, G
Conductance
ult of contact between moving molecules in the system.
structures of the middle ear when the sweep pressure approaches the tympanometric peak pressure.
Being a frictional element,
App. 1.5.3 B/G viewing of tympanograms
Viewing dual component (B/G) tympanograms is preferable to admittance magnitude (Y) tympanograms in the higher probe
tone frequency region.
This is because the
When the probe tone frequency approaches the
Compliance
ing
Notching, if sufficiently pronounced, will also show in the total Admittance curve, and may make the curve difficult to
interpret, especially with regard to normative data.
Otometrics - MADSEN Zodiac
Mass
controlled.
Susceptance
Susceptance
Susceptance
is the amount of energy that dissipates as heat due to the friction in the ear system. Friction occurs as a res-
Conductance
can never take a negative value.
Mass
elements have an increasingly pronounced impact on the tympanogram with higher frequencies.
Susceptance
contribution to
App. 1 MADSEN Zodiac immittance methodology and features
Compliance
Mass
elements, then the
Compliance
elements and
Mass
controlled. This means that the probe tone frequency is the same
, it is helpful to baseline compensate the
Susceptance
.
of the air that is enclosed between the probe tip and the tympanic
Susceptance
. This is mainly
Susceptance
Conductance
typically increases when more energy reaches the
Mass
controlled frequency region, the increasing
Susceptance
will pull the curve down, and cause notching of the curve.
Susceptance
elements of the ear,
Susceptance
is negative. The ear
Mass
elements, then the
Susceptance
Compliance Susceptance
tympanogram can then be determ-
Mass
is positive.
Susceptance
curve. This is
Mass
, since the
and the decreas-
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