CNIM: ACNS GUIDELINES EXAM QUESTIONS AND ANSWERS
1. The purpose of computerized EEG analysis is to:: The purpose of
computerized EEG analysis is to produce real-time information, which can be
immediately assessed in a "user-friendly" manner and applied to patient care.
2. Input signals with peak-to-peak amplitudes of - should be
amplified equal to the full range of the analog-to-digital (A-D)
converter.: Input signals with peak-to-peak amplitudes of 5 uV to 50 uV should
be amplified equal to the full range of the analog-to-digital (A-D) converter.
3. Input signals with peak-to-peak amplitudes of 5 uV to 50
uV should be amplified equal to .: Input signals with peak-to-peak
amplitudes of 5 uV to 50 uV should be amplified equal to the full range of the analog-to-
digital (A-D) converter
4. Gain should be adjustable in steps of not more than - .:
Gain should be adjustable in steps of not more than 2.5 to 1.
5. The differential input impedance of the amplifier must be at
least .-
: The ditterential input impedance of the amplifier must be at least 100 megOhm
6. The common mode rejection should be at least at the highest
sensitivity of the amplifier when the common mode signal is
applied between both inputs and neutral.: The common mode rejection
,should be at least 80 dB (10,000:1) at the highest sensitivity of the amplifier when the
common mode signal is applied between both inputs and neutral.
7. With filters wide open, the amplifier bandpass measured at the
dB points must be at least Hz.
The rolloff slopes of the filters must be specified.: With filters wide open,
the amplifier bandpass measured at the -3 dB points must be at least 0.1-5,000 Hz. The
rollott slopes of the filters must be specified.
8. The noise level of the amplifier must not exceed with the
inputs connected to neutral and with a bandpass of 0.1-5,000 Hz:
The noise level of the amplifier must not exceed 2 uV rms with the inputs
connected to neutral and with a bandpass of 0.1-5,000 Hz
9. The noise level of the amplifier must not exceed 2 uV rms
with the inputs connected to neutral and with a bandpass of
Hz: The noise level of the amplifier must not exceed 2 uV rms with the inputs connected
to neutral and with a bandpass of 0.1-5,000 Hz
10. Time (horizontal) resolution of the system should be or less:
Time (horizontal) resolution of the system should be 20 μs/data point or less
11. An amplitude resolution of bits at the A-D converter is
adequate for many applications, but bit A-D converters are
preferred because they are
, usable across a broader dynamic range: An amplitude resolution of
eight bits at the A—D converter is adequate for many applications, but 12-bit A—D
converters are preferred because they are usable across a broader dynamic range
12. The system should allow averaging at least trials: The system
should allow averaging at least 4,000 trials
13. At least channels are the minimum necessary for PREP
and SSEP studies. channels are the minimum for BAEP studies:
At least four channels are the minimum necessary for PREP and SSEP studies.
Two channels are the minimum for BAEP studies
14. Chassis leakage should be less than with ground open:
Chassis leakage should be less than 300 uA rms with ground open
15. current limiting must be present in every patient lead. In
these areas the maximum leakage current through patient leads
should be .: current
limiting must be present in every patient lead. In these areas the maximum leakage current
through patient leads should be 10 uA rms to ground with 120 VAC applied
16. The maximum leakage current should be at the patient end
of the cable when the power line ground is disconnected.: The
maximum leakage current should be 50 uA rms at the patient end of the cable
when the power line ground is disconnected.
17. In general, the ratio of the high-to-low frequency filter
settings should be at least to be confident that filter-induced
phase shifts are minimized: In general, the ratio of the high-to-low frequency
filter settings should be at least 100:1 to be confident that filter-induced phase shifts are
minimized
18. Digital filtering and smoothing algorithms will affect...: amplitude
1. The purpose of computerized EEG analysis is to:: The purpose of
computerized EEG analysis is to produce real-time information, which can be
immediately assessed in a "user-friendly" manner and applied to patient care.
2. Input signals with peak-to-peak amplitudes of - should be
amplified equal to the full range of the analog-to-digital (A-D)
converter.: Input signals with peak-to-peak amplitudes of 5 uV to 50 uV should
be amplified equal to the full range of the analog-to-digital (A-D) converter.
3. Input signals with peak-to-peak amplitudes of 5 uV to 50
uV should be amplified equal to .: Input signals with peak-to-peak
amplitudes of 5 uV to 50 uV should be amplified equal to the full range of the analog-to-
digital (A-D) converter
4. Gain should be adjustable in steps of not more than - .:
Gain should be adjustable in steps of not more than 2.5 to 1.
5. The differential input impedance of the amplifier must be at
least .-
: The ditterential input impedance of the amplifier must be at least 100 megOhm
6. The common mode rejection should be at least at the highest
sensitivity of the amplifier when the common mode signal is
applied between both inputs and neutral.: The common mode rejection
,should be at least 80 dB (10,000:1) at the highest sensitivity of the amplifier when the
common mode signal is applied between both inputs and neutral.
7. With filters wide open, the amplifier bandpass measured at the
dB points must be at least Hz.
The rolloff slopes of the filters must be specified.: With filters wide open,
the amplifier bandpass measured at the -3 dB points must be at least 0.1-5,000 Hz. The
rollott slopes of the filters must be specified.
8. The noise level of the amplifier must not exceed with the
inputs connected to neutral and with a bandpass of 0.1-5,000 Hz:
The noise level of the amplifier must not exceed 2 uV rms with the inputs
connected to neutral and with a bandpass of 0.1-5,000 Hz
9. The noise level of the amplifier must not exceed 2 uV rms
with the inputs connected to neutral and with a bandpass of
Hz: The noise level of the amplifier must not exceed 2 uV rms with the inputs connected
to neutral and with a bandpass of 0.1-5,000 Hz
10. Time (horizontal) resolution of the system should be or less:
Time (horizontal) resolution of the system should be 20 μs/data point or less
11. An amplitude resolution of bits at the A-D converter is
adequate for many applications, but bit A-D converters are
preferred because they are
, usable across a broader dynamic range: An amplitude resolution of
eight bits at the A—D converter is adequate for many applications, but 12-bit A—D
converters are preferred because they are usable across a broader dynamic range
12. The system should allow averaging at least trials: The system
should allow averaging at least 4,000 trials
13. At least channels are the minimum necessary for PREP
and SSEP studies. channels are the minimum for BAEP studies:
At least four channels are the minimum necessary for PREP and SSEP studies.
Two channels are the minimum for BAEP studies
14. Chassis leakage should be less than with ground open:
Chassis leakage should be less than 300 uA rms with ground open
15. current limiting must be present in every patient lead. In
these areas the maximum leakage current through patient leads
should be .: current
limiting must be present in every patient lead. In these areas the maximum leakage current
through patient leads should be 10 uA rms to ground with 120 VAC applied
16. The maximum leakage current should be at the patient end
of the cable when the power line ground is disconnected.: The
maximum leakage current should be 50 uA rms at the patient end of the cable
when the power line ground is disconnected.
17. In general, the ratio of the high-to-low frequency filter
settings should be at least to be confident that filter-induced
phase shifts are minimized: In general, the ratio of the high-to-low frequency
filter settings should be at least 100:1 to be confident that filter-induced phase shifts are
minimized
18. Digital filtering and smoothing algorithms will affect...: amplitude
