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EEG Study Guide for registry (ASET Review Questions)
EEG Study Guide for registry (ASET Review Questions)
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EEG Study Guide for registry (ASETReview Questions)
The basic unit for measuring current flow is? - -Ampere
-The basic unit of resistance? - -Ohm
-Which of the following is not a valid expression of Ohm's law?
A. R=EI or R=VI
B. E=IR or V=IR
C. I=E/R or I=V/R
D. R=E/I or R=V/I - -A. R=EI or R=VI
-Which of the following is not a unit for measuring alternating frequencies?
A. Cycles per sec
B. Volts
C. Hertz
D. Kilocycles - -B. Volts
-Which of the following describes the action of a capacitor?
A. opposes changes in current flow
B. converts alternating current to direct current
C. creates direct current resistance
D. stores energy - -D. stores energy
-What is a filter? - -A circuit that allows some frequencies to pass through it,
while others are blocked
-What is an amplifier? - -A combination of electronic components designed
to increase the power, voltage or current of a signal.
-A small fluctuating output recorded by the EEG instrument even when there
is no input signal is called:
a. output voltage
b. linear distortion
c. 60Hz interference
d. noise - -D. noise
-The EEG amplifier is designed so that when input 1 is more negative then
input 2, the deflection will be? - -Upward
-What is common mode rejection? - -the characteristic of an amplifier that
rejects external interference
,-Which of the following is most attenuated by a low frequency filter of 1 Hz?
A. .5hz
B. 5hz
C. 10 hz
D. .1hz - -D. 0.1hz
-Time constant is defined as the time required - - -for the deflection to fall
(decay) to 37% of the peak deflection.
-A high frequency setting of 35hz would attenuate 50hz muscle activity by
approximately what percentage? - -40%
-According to ACNS Guidelines, recording clinical EEG on digital media
requires monitors to have? - -Between 25 and 35 mm/second horizontal
scaling and a minimum of 100 data points/second to accurately display EEG
on the monitor screen.
-The filter creating a very narrow band pass that should rarely be used
clinically-
a. LF 5.0 and HF 70hz
b. LF 5.0 and HF 15hz
c. LF 0.1 and HF 70hz
d. LF 0.1 and HF 15hz - -B. LF 5.0 and HF 15hz
-During the recording of cerebral activity, the calibration input voltage is
changed from 50uv to 100uv. What will be the result?
A. no effect on the activity being recorded
B. a two fold increase in amplitude
C. a one half reduction of amplitude
D. clipping of the waveform - -A. no effect on the activity being recorded
-According the ACNS guidelines 2006, the minimum sampling rate for EEG
Data, should be at least____________times the highest high frequency filter
setting. - -Three
-In a record with 10hz alpha activity. When the display epoch is changed
from 10 seconds per display screen to 20 seconds per display screen, the
frequency of the activity will be________ - -10hz
-Guidelines for recording digital EEG are written by: - -The american clinical
neurophysiology society (ACNS)
-The term RAM means: - -TEMPORARY MEMORY STORAGE THAT IS CRITICAL
TO RAPID COMPUTER OPERATIONS
-Three basic computer ports are: - -serial, parallel, usb
, -The best metals for clinical EEG recording are_________? - -Silver-silver
chloride, platinum or gold
-Which of the following is not related to measuring electrode resistance?
A. opposition to direct current flow
B. measurement while the electrode is unattached to the scalp
C. measurement with an ohmmeter
D. opposition to alternating current flow - -D. opposition to alternating
current flow
-The electrode site that is located 1cm above, one third the distance out
from the left external auditory meatus toward the left outer canthus is
called? - -T1 or F9
-Due to a central scalp lesion, C4 has to be relocated 4mm anteriorly. The
technologist should:
a. relocate C3 4mm anteriorly
b. make no other placement changes
c. relocate P3 4mm anteriorly
d. relocate all electrodes in the right parasagittal plane 4mm anteriorly - -a.
relocate C3 4mm anteriorly
-A patient can become the pathway for least resistance and therefore
electically susceptable to shock when;
a. the recording instrument is turned on
b. the electrode test is utilized
c. depth electrodes are used
d. the patient has an indwelling heart catheter - -d. the patient has
indwelling heart catheter
-Eye leads placed at the outer canthus of each eye will record:
a. all eye movements
b. horizontal & vertical eye movements
c. only vertical eye movements
d. mainly horizontal eye movements - -d. mainly horizontal eye movements
-which of the following is not a physiological artifact?
a. perspiration
b. glossokinetic response
c. 60hz interference
d. eye movement - -c. 60hz interference
-Which of the following is not a source of 60hz interference?
a. other equipment in the room
b. faulty ground connection
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