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Pure Tone Audiometry Basic Principles of Sound The Audiometer

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Presentation on theme: "Pure Tone Audiometry Basic Principles of Sound The Audiometer"— Presentation transcript:

1 Pure Tone Audiometry Basic Principles of Sound The Audiometer
Test Environment Patient’s Role Clinician’s Role Air Conduction Audiometry Bone Conduction Audiometry Audiogram Interpretation Masking

2 Basics of Sound Sound Waves and Propagation of Sound Frequency (Hz)
Resonance Intensity (The Decibel or dB)

3 Audiometer Generic Audiometer

4 Audiometer Clinical and Portable Audiometer

5 Audiometer Earphones

6 Audiometer Insert Earphone

7 Audiometer Bone Conduction Vibrator

8 Audiometer Computerized Audiometer

9 Test Environment Sound Treated Booth

10 Test Environment Circumaural Enclosures

11 Test Environment Quiet Room

12 Patient’s Role Hand Raising Signal Button Verbal Response
False Positives and False Negatives

13 Clinician’s Role Instructions Patient’s Position
Placement of Earphones Test Procedures for Screening Test Procedures for Pure Tone Thresholds

14 Clinician’s Role Instructions What are they listening for
How to respond Verify they understand instructions

15 Clinician’s Role Position of Client - Adults and Children
Earphone Placement

16 Clinician’s Role Screening Test Procedures (adults) Instructions
Test Frequencies Disposition of Failures

17 Clinician’s Role Pure Tone Threshold Procedures Self-test
Place earphones on patient Test better ear first Order of test frequencies Test other ear Use ASHA protocol for threshold testing.

18 Clinician’s Role Pure Tone Average (PTA) Three tone average
Two tone average Other methods

19 Clinician’s Role Degree of Hearing Loss based on PTA None Slight Mild
Moderate Moderately Severe Severe Profound

20 Clinician’s Role Role of Bone Conduction Purpose Mastoid Placement
Forehead Placement

21 Audiograms Basic Audiogram

22 Audiograms Symbols

23 Audiograms Type Degree Configuration

24 Audiograms Type of Loss - Conductive

25 Audiograms Type of Loss - Sensorineural

26 Audiograms Type of Loss - Mixed

27 Audiograms Configuration of Loss - Flat

28 Audiograms Configuration of Loss - Sloping (falling)

29 Audiograms Configuration of Loss - Rising

30 Audiograms Configuration of Loss - Tent

31 Audiograms Configuration of Loss - Mid-frequency or Cookie-bite

32 Masking Cross Hearing and Interaural Attenutation Masking Defined
Rules Types of Masking Noise

33 Masking Cross Hearing Interaural Attenuation Definition Variables
transducers frequency individual variability

34 Masking Definition Introduction of noise in NTE for the purpose of eliminating cross-hearing.

35 Masking Rule Minimum IA values
Apply masking to NTE whenever the AC of the TE exceeds the BC for the NT cochlea by the amount of the minimum IA values. Minimum IA values Supraaural phones = 40 dB Insert phones = 70 dB Bone conduction = 0 dB

36 Masking Types of Masking Noise White Noise Narrow Band Noise

37 Summary

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