Preforming the Study - ASAP R.EEG.T
Term used to describe the way a signal is sampled at intervals and assigned a numeric
value: - answer Sampling Rate
Why is it not best practice to allow an outpatient to sleep throughout the entire EEG
recording? - answer Unable to evaluate the patient's background rhythm.
What additional electrodes could be placed to help decipher between artifact and
cortical activity in this sample? – answer EOG electrodes
What additional monitoring should be done in a middle age patient who repeatedly
alerts from sleep during the EEG? - answer Respiration
What type of monitoring would be useful in an EEG patient experiencing syncope? –
answer ECG
An abbreviated 10-20 placement, respiration, ECG and EOG monitors should be used
when recording - answer Neonates
Which of the following extra electrodes might best demonstrate the EEG activity
associated with focal motor twitching of the right corner of the mouth? - answerC5
Cortical EEG recordings can be obscured in patients who are tense and anxious due to
- answerMyogenic artifact
Sphenoidal electrodes are used to record activity from the - answeranterior temporal
lobes
BRAIN ABCESS - answerFocal polymorphic delta activity
Which of the following montages would best display the amplitude of a left temporal
spike? - answerLeft temporal to the contralateral ear
A slow wave focus is best seen with - answerLF 0.3HZ, paper speed 15mm/sec
Laplacian montage - answersource reference derivation
Referential recording is most appropriate for measuring - answervoltage
Which of the following is the most appropriate instrumentation setting change that
should be made in order to enhance cortical slowing? - answerChange the LFF from 1
Hz. To .1 Hz.
,The best reference electrode in an awake patient with excessive temporal myogenic
activity would be - answerCZ
When using the average reference, if a spike-and-wave focus appears at C3, the
abnormality would be best enhanced by - answerExcluding C3 and surrounding
electrodes from reference.
To enhance the background alpha and beta asymmetry in an EEG record showing
moderately high voltage delta activity, the technologist should use a - answershorter
time constant and increased sensitivity
Which of the following settings could be used to reduce the effects of sweat artifact in a
patient with asymmetrical low-voltage fast activity? - answerS=5 microvolts/mm, LF=5
Hz, HF=70 Hz
Which montage would be best to localize occipital spikes by phase reversal? -
answerCircumferential bipolar montage
Fourteen and six Hz positive spikes are best recorded with - answerthe contralateral ear
reference.
Of the following, the BEST choice of reference to be used when recording in suspected
temporal lobe epilepsy is: - answerCZ
When attempting to minimize relentless muscle artifact on a recording, the technologist
should be aware that lowering the high filter could cause the artifact to resemble: -
answerbeta activity.
Which combination of settings will help enhance a low voltage slow wave that is being
masked by muscle activity? - answerSens 5; LF .3; HF 35
A waveform of 0.5 Hz can be best enhanced with a filter of - answerLF 0.3 Hz
For low frequency filters (LFFs), the corresponding time constants for LFF cutoff
frequency of 3 Hz would be - answer0.05 sec
Increasing the number of seconds displayed on the monitor - answerdoes not change
spike amplitude or duration
A device that alters the amplitude of specific frequencies of a signal: - answerfilter
FREQUENCY - answerinfluenced by sampling rate and measured in hertz
The ability of an amplifier to reject like signals. - answercommon mode rejection
, Gradual changes in amplitude, frequency, or spatial distribution of rhythms is known as:
- answerEvolution
Which of the following instruments magnifies the common-mode voltage difference
between two inputs? - answerDifferential Amplifier
Which of the following instrumentation setting change may result in the elimination of
cortical spikes? - answerChange the HFF from 70 Hz. To 15 Hz.
2016 ACNS guidelines recommends a CMRR of at least: - answer90 dB
Signals common to both inputs of a differential amplifier with like frequency, amplitude
and phase are: - answercanceled
VOLTAGE RESOLUTION - answerAnalog-to-digital converter
All of the following factors favor cancellation of signals in the two inputs of an amplifier,
except - answerunequal impedances in the inputs.
What happens when a 60 cycle sine wave is sampled at 100 hertz? - answeraliasing
UNDERSAMPLING - answerAliasing
The amount by which the differential amplifier increases the magnitude of the input
signal is its - answersensitivity.
What is the specification of the minimum sampling rate used, in relation to the highest
frequency signal recorded? - answerNyquist theory
Doubling the inter-electrode distances will have what effect on the waveforms? -
answerIncrease amplitude
TIME CONSTANT - answerLow frequency filter
A 0.5 Hz wave is enhanced without affecting a spike by using - answerLF 0.3HZ
2016 ACNS Guidelines recommends a minimum horizontal resolution of: - answer16
bits
Low sampling rate may cause fast frequencies to appear slower: - answeraliasing
With high frequency filtering, muscle artifact may become distorted and look like -
answerbeta activity.
Which of the following is the most appropriate sampling rate that should be used for a
HFF setting of 70Hz., according to Nyquist theory? - answer210 p sec
Term used to describe the way a signal is sampled at intervals and assigned a numeric
value: - answer Sampling Rate
Why is it not best practice to allow an outpatient to sleep throughout the entire EEG
recording? - answer Unable to evaluate the patient's background rhythm.
What additional electrodes could be placed to help decipher between artifact and
cortical activity in this sample? – answer EOG electrodes
What additional monitoring should be done in a middle age patient who repeatedly
alerts from sleep during the EEG? - answer Respiration
What type of monitoring would be useful in an EEG patient experiencing syncope? –
answer ECG
An abbreviated 10-20 placement, respiration, ECG and EOG monitors should be used
when recording - answer Neonates
Which of the following extra electrodes might best demonstrate the EEG activity
associated with focal motor twitching of the right corner of the mouth? - answerC5
Cortical EEG recordings can be obscured in patients who are tense and anxious due to
- answerMyogenic artifact
Sphenoidal electrodes are used to record activity from the - answeranterior temporal
lobes
BRAIN ABCESS - answerFocal polymorphic delta activity
Which of the following montages would best display the amplitude of a left temporal
spike? - answerLeft temporal to the contralateral ear
A slow wave focus is best seen with - answerLF 0.3HZ, paper speed 15mm/sec
Laplacian montage - answersource reference derivation
Referential recording is most appropriate for measuring - answervoltage
Which of the following is the most appropriate instrumentation setting change that
should be made in order to enhance cortical slowing? - answerChange the LFF from 1
Hz. To .1 Hz.
,The best reference electrode in an awake patient with excessive temporal myogenic
activity would be - answerCZ
When using the average reference, if a spike-and-wave focus appears at C3, the
abnormality would be best enhanced by - answerExcluding C3 and surrounding
electrodes from reference.
To enhance the background alpha and beta asymmetry in an EEG record showing
moderately high voltage delta activity, the technologist should use a - answershorter
time constant and increased sensitivity
Which of the following settings could be used to reduce the effects of sweat artifact in a
patient with asymmetrical low-voltage fast activity? - answerS=5 microvolts/mm, LF=5
Hz, HF=70 Hz
Which montage would be best to localize occipital spikes by phase reversal? -
answerCircumferential bipolar montage
Fourteen and six Hz positive spikes are best recorded with - answerthe contralateral ear
reference.
Of the following, the BEST choice of reference to be used when recording in suspected
temporal lobe epilepsy is: - answerCZ
When attempting to minimize relentless muscle artifact on a recording, the technologist
should be aware that lowering the high filter could cause the artifact to resemble: -
answerbeta activity.
Which combination of settings will help enhance a low voltage slow wave that is being
masked by muscle activity? - answerSens 5; LF .3; HF 35
A waveform of 0.5 Hz can be best enhanced with a filter of - answerLF 0.3 Hz
For low frequency filters (LFFs), the corresponding time constants for LFF cutoff
frequency of 3 Hz would be - answer0.05 sec
Increasing the number of seconds displayed on the monitor - answerdoes not change
spike amplitude or duration
A device that alters the amplitude of specific frequencies of a signal: - answerfilter
FREQUENCY - answerinfluenced by sampling rate and measured in hertz
The ability of an amplifier to reject like signals. - answercommon mode rejection
, Gradual changes in amplitude, frequency, or spatial distribution of rhythms is known as:
- answerEvolution
Which of the following instruments magnifies the common-mode voltage difference
between two inputs? - answerDifferential Amplifier
Which of the following instrumentation setting change may result in the elimination of
cortical spikes? - answerChange the HFF from 70 Hz. To 15 Hz.
2016 ACNS guidelines recommends a CMRR of at least: - answer90 dB
Signals common to both inputs of a differential amplifier with like frequency, amplitude
and phase are: - answercanceled
VOLTAGE RESOLUTION - answerAnalog-to-digital converter
All of the following factors favor cancellation of signals in the two inputs of an amplifier,
except - answerunequal impedances in the inputs.
What happens when a 60 cycle sine wave is sampled at 100 hertz? - answeraliasing
UNDERSAMPLING - answerAliasing
The amount by which the differential amplifier increases the magnitude of the input
signal is its - answersensitivity.
What is the specification of the minimum sampling rate used, in relation to the highest
frequency signal recorded? - answerNyquist theory
Doubling the inter-electrode distances will have what effect on the waveforms? -
answerIncrease amplitude
TIME CONSTANT - answerLow frequency filter
A 0.5 Hz wave is enhanced without affecting a spike by using - answerLF 0.3HZ
2016 ACNS Guidelines recommends a minimum horizontal resolution of: - answer16
bits
Low sampling rate may cause fast frequencies to appear slower: - answeraliasing
With high frequency filtering, muscle artifact may become distorted and look like -
answerbeta activity.
Which of the following is the most appropriate sampling rate that should be used for a
HFF setting of 70Hz., according to Nyquist theory? - answer210 p sec
