Cochlear SPrint Sound Processor Informacje Techniczne Strona 68
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SECTION TWO | CLINICAL GUIDANCE
66
2.1.1.4 Fine Tuning the ABI
Balancing/sweeping
Before carrying out any pitch perception test, it is important to balance the
loudness of all functional channels. To achieve this, first balance at C-level, and
then at 50% of the dynamic range.
• Balancing at C-level – Use the Sweep option to stimulate pairs/groups
of channels at C-level, making adjustments as appropriate. Always use one
balanced channel as a reference for the next one. Do not balance channels
with reduced loudness due to a side effect but, instead, balance other
electrodes and then consider omitting this electrode from the final MAP.
This is particularly relevant if, after pitch ranking, this electrode falls into
the more useful frequency range, below 4 kHz.
• Balancing at 50% of dynamic range – Carry out loudness balancing
at 50% of the T-C range and then adjust the T-level to compensate, e.g.
reduce the T-level for any channel that sounds louder than its neighbour.
Pitch-ranking
Unlike the cochlear implant electrode array, it cannot be assumed that there is a
definite tonotopicity across the auditory brainstem implant electrode array. This
makes it essential to pitch rank all functional channels before creating a MAP.
Pitch ranking is generally quite difficult for Nucleus 24 ABI recipient because:
• most recipients report a mixed or complex pitch percept on each
channel in response to stimulation and these are difficult to compare
with one another
• many channels may sound quite similar in overall pitch
• changing the stimulus intensity may change the pitch percept on
an individual channel
Use the Nucleus 24 ABI Pitch Ranking Worksheet (Figure 9) to compare
successive electrode pairs.
Tip: Use the Set Levels screen to present stimuli. Deactivate all channels except
the two that require comparing and then use the sweep or balance option.
N33595F ISS3 FEB10
- Cochlear 1
- Getting started 5
- T-level Assessment Procedures 6
- C-level Assessment Procedures 7
- 1.1.1 Behavioural Procedures 9
- Figure 2 : Loudness 18
- Base Level = 4 18
- Q varies 18
- 1.5 STIMULATION MODES 19
- Figure 3: Bipolar 20
- 1.6 TELEMETRY MEASUREMENTS 22
- and N24 series Cochlear 23
- Implant Systems 23
- 1.7 VOLTAGE COMPLIANCE 23
- 1.7.1 CI500 series, Freedom 23
- 1.7.2 Nucleus 24
- 24 System 24
- 1.7.3 Nucleus 25
- 22 System 25
- 1.8 POWER OPTIMIZATION 25
- 1.9 SOUND CODING STRATEGIES 29
- 1.9.1 ACE 30
- /ACE (RE) 30
- 1.9.2 SPEAK 31
- 1.9.3 CIS/CIS (RE) 33
- 1.11.1 Microphone Sensitivity 36
- 1.11.2 Volume Setting 37
- 1.12 NUCLEUS 38
- SMARTSOUND 38
- 1.12.1 ADRO 38
- 1.12.2 Whisper 39
- Whisper boosts soft 40
- 1.12.3 Focus (using Beam 41
- Figure 13 : A block 42
- 1.12.4 Zoom 45
- CP810 Zoom 46
- Freedom Dir / 46
- CP810 Standard 46
- (without zoom) 46
- Processor 46
- 1.12.5 Autosensitivity 47
- 1.13 SMARTSOUND 48
- ENVIRONMENTS 48
- Environment Options 49
- EVERYDAY 49
- 1.14 OBJECTIVE MEASUREMENTS 51
- 1.15 GUIDANCE FOR FM FITTINGS 53
- 1.15.1 CP810 Sound Processors 53
- SECTION 2: PROGRAMMING 57
- RECOMMENDATIONS FOR 57
- SPECIALTY DEVICES 57
- Figure 2: 58
- Descriptive 58
- Nucleus 24 ABI 58
- 2.1.1.2 Programming the ABI 59
- Pitch magnitude 1 – 100 60
- Loudness 1 – 10 60
- Figure 8 : T-levels 66
- 2.1.1.3 Managing Side Effects 67
- 2.1.1.4 Fine Tuning the ABI 68
- Figure 9 : Nucleus 70
- ABI 24M pitch 70
- 2.1.1.6 Rehabilitation 71
- 2.1.1.7 ABI Worksheets 72
- 2.1.2 THE NUCLEUS 74
- 24 DOUBLE ARRAY 74
- CLINICAL GUIDANCE 77
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