Term
Wideband Reflectance:
-Introduce sounds (___ to ___ Hz) into the canal (incident energy)
-Measure amount of energy ___ back from the ME
-___ ___ R(f): complex number that compares sound pressure of incident wave to sound pressure of the reflected wave
-___/___ reflectance (ER): the square of the pressure reflectance magnitude, R = ∣R(f)∣2 |
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Definition
| 200 to 10,000; reflected; Pressure reflectance; Power or energy |
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Term
| the ratio of reflected pressure wave over incident pressure wave |
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Definition
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Term
wideband reflectance: values
-___ ___): ratio of reflected energy to incident energy
-Ranges from 0 to 1:
*__: all energy was absorbed by the ME
*__: all energy was reflected by the ME
-Differs from standard immittance measures because ER
measures are independent of: probe ___ in canal and ___ ___ characteristics |
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Definition
| Energy reflectance (ER); 0; 1; location; ear canal |
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Term
Instrumentation: MEPA System
-Portable, ___ ___ unit (APU) & ___ system
-Probe presents ___ stimulus
-Calibrate chirp stimulus in a __-cavity calibration chamber
-Equipment use combines measuring known ___
curves in calibration cavity and with measured ___ in ear
canals |
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Definition
| audio processing; probe; chirp; 4; ER; values |
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Term
___ ___ ___ ___:
-Made by Mimosa Acoustics
-Measures ER & OAEs
-Controlled by laptop & software
-Measures WBR at ambient pressure only |
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Definition
| Middle Ear Power Analyzer (MEPA) |
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Term
Measuring Wideband Reflectance:
-Stimulus is presented to the ___ & partly reflected from the ___
-Test time < __ minute
-Hermetic seal is not needed, measured at ___ pressure
-Insertion ___ of probe & ___ influence results
-Limitation: highly-___results |
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Definition
| EAC; TM; 1; ambient; depth; seal; variable |
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Term
WBR Tympanometry:
-Can measure ER at ___ pressure
-Can measure ER at various ___ points between 226 Hz & 8000 Hz
-Can measure ___ & ___ |
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Definition
| ambient; pressure; tympanometry; reflexes |
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Term
Normal Wideband Energy Reflectance (Adults):
Normal findings:
-high reflectance in ___ frequencies
-minimum reflectance @ ___-___ kHz
-increased reflectance in ___ frequencies |
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Definition
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Term
Values Outside Normal Suggest Middle Ear Disorder:
-Higher than normal reflectance at LFs suggests increased ___ (OME or otosclerosis)
-Lower than normal reflectance at LFs suggests ___ stiffness (monomeric TM or discontinuity) |
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Definition
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Term
| ER below 1 kHz is lower in ears with discontinuity suggests ___ ___ |
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Definition
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Term
-Ears with negataive pressure & effusion show ___ ER @ mid- to high-frequencies
-Ears with effusion have ___ ER since fluid reduces volume |
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Definition
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Term
| Decreased ER across all freqs compared to normal suggests ___ ___ |
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Definition
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