CROS, BC, & IMPLANTED HEARING AIDS ASSESSMENT EXAM QUESTIONS & CORRECT ANSWERS GRADED A+

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.




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,• 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


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, • 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.




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