CROS, BC, & IMPLANTED HEARING AIDS ASSESSMENT
EXAM QUESTIONS & CORRECT ANSWERS GRADED A+
What are CROS hearing aids and what do they do? - CORRECT ANSWER >>>• Contralateral
Routing of Signals
• Wired or wireless transmission of signal from
- One hearing aid case/ear with transmitter
- Other hearing aid case/ear with receiver
SIMPLE CROS AIDS - CORRECT ANSWER >>>
What is the simple Cros aids? - CORRECT ANSWER >>>• See Figure 17.1 in Text
• Satellite microphone on poorer/dead ear
- Feeds output to opposite ear
When do we use CROS? - CORRECT ANSWER >>>• Better/normal or near-normal ear with
open fit earmold and hearing aid case with receiver and amplifier
and when other ear is unaidable
What is the impact of CROS? - CORRECT ANSWER >>>• Improved SNR when speech is on
poor ear side & noise on good ear side.
1|Page
,• Decreased SNR when speech is on good ear side
& noise on bad ear side.
- Minimize decreased SNR by using little or no gain
What is the candidacy for a simple CROS? - CORRECT ANSWER >>>• Unilateral un-aidable
hearing loss in one ear & normal/near normal hearing in other ear.
• CROS users may not wish to use system in quiet
environments
What is a BICROS? - CORRECT ANSWER >>>• See Figure 17.4.
• Bilateral CROS for 1 un-aidable ear and 1 ear with
some hearing loss.
• Microphone is on each ear and they are both
connected to the same amplifier and receiver (on
better ear).
What is the candidacy for a BICROS? - CORRECT ANSWER >>>• Individual may be a candidate
for a BAHA or CI on the poorer ear
What is a transcranial CROS? - CORRECT ANSWER >>>• Also Power CROS or Internal CROS
• Transmits signal from bad ear to good ear via
BC
2|Page
, • Need power aid and BC transmission thru vibration of
temporal bone & need a deep fit to vibrate the bony
canal wall
What does the transcranial CROS do? - CORRECT ANSWER >>>vibrates the osseous portion of
the ear canal
Nonvisible
BAHAs and Transcranial CROS cannot have Real-ear done. What is another option? - CORRECT
ANSWER >>>free field testing
What si the candidanct for transcranial CROS? - CORRECT ANSWER >>>need to consider
hearing in better ear.
Best candidates not known
What is the fitting procedure for Transcranial? - CORRECT ANSWER >>>• Goal is a strong BC
signal and that cannot be measured using real ear system.
• Can check the volume for loudspeaker sounds at
45 angles on both sides of head and try to match.
Are bone conduction hearing aids different from BAHAs? - CORRECT ANSWER >>>Yes.
3|Page
EXAM QUESTIONS & CORRECT ANSWERS GRADED A+
What are CROS hearing aids and what do they do? - CORRECT ANSWER >>>• Contralateral
Routing of Signals
• Wired or wireless transmission of signal from
- One hearing aid case/ear with transmitter
- Other hearing aid case/ear with receiver
SIMPLE CROS AIDS - CORRECT ANSWER >>>
What is the simple Cros aids? - CORRECT ANSWER >>>• See Figure 17.1 in Text
• Satellite microphone on poorer/dead ear
- Feeds output to opposite ear
When do we use CROS? - CORRECT ANSWER >>>• Better/normal or near-normal ear with
open fit earmold and hearing aid case with receiver and amplifier
and when other ear is unaidable
What is the impact of CROS? - CORRECT ANSWER >>>• Improved SNR when speech is on
poor ear side & noise on good ear side.
1|Page
,• Decreased SNR when speech is on good ear side
& noise on bad ear side.
- Minimize decreased SNR by using little or no gain
What is the candidacy for a simple CROS? - CORRECT ANSWER >>>• Unilateral un-aidable
hearing loss in one ear & normal/near normal hearing in other ear.
• CROS users may not wish to use system in quiet
environments
What is a BICROS? - CORRECT ANSWER >>>• See Figure 17.4.
• Bilateral CROS for 1 un-aidable ear and 1 ear with
some hearing loss.
• Microphone is on each ear and they are both
connected to the same amplifier and receiver (on
better ear).
What is the candidacy for a BICROS? - CORRECT ANSWER >>>• Individual may be a candidate
for a BAHA or CI on the poorer ear
What is a transcranial CROS? - CORRECT ANSWER >>>• Also Power CROS or Internal CROS
• Transmits signal from bad ear to good ear via
BC
2|Page
, • Need power aid and BC transmission thru vibration of
temporal bone & need a deep fit to vibrate the bony
canal wall
What does the transcranial CROS do? - CORRECT ANSWER >>>vibrates the osseous portion of
the ear canal
Nonvisible
BAHAs and Transcranial CROS cannot have Real-ear done. What is another option? - CORRECT
ANSWER >>>free field testing
What si the candidanct for transcranial CROS? - CORRECT ANSWER >>>need to consider
hearing in better ear.
Best candidates not known
What is the fitting procedure for Transcranial? - CORRECT ANSWER >>>• Goal is a strong BC
signal and that cannot be measured using real ear system.
• Can check the volume for loudspeaker sounds at
45 angles on both sides of head and try to match.
Are bone conduction hearing aids different from BAHAs? - CORRECT ANSWER >>>Yes.
3|Page
