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28 Cards in this Set
- Front
- Back
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True or False
If input one is more negative than input 2 the deflection of the waveform will be up |
True
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Impedance is defined as:
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the resistance against alternating current flow
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A bipolar montage follows which rules?
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combines serial pairs of electrodes into a chain, in a chain of electrodes input 2 of one channel is the same electrode as input 1 of the next, left side electrodes appear first followed by the right side
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What is the amplitude (uV) of activity that measured 12 mm in height, if a 50 uV calibration signal measured 6 mm?
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100 uV
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nasopharyngeal electrodes are placed where:
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through the nasal passage
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If the vertical scale (sensitivity) is 5 uV/mm, then a 60uV will measure:
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12 mm
(60uV/5uV/mm) |
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Best montage to measure the amplitude of a sharp wave?
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A2 ear reference montage
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A faster sweep speed (60mm/sec) allows:
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easier measurements of faster frequencies, easier ID of 60 hz artifact, better ID of degree of synchrony between 2 hemispheres.
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The use of 60hz notch filter does what:
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eliminates 60 hz activity only
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The average reference recording is best used for:
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localize focal activity
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Sensitivity is conventionally defined by:
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ratio of voltage to height
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What type of montage combines activity from many electrodes to form a reference?
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Average reference
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which type of montage most gives the true amplitude EEG activity at a given electrode?
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non-cephalic reference
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The time constant of .1 second is aprox. equivalent to what low filter setting?
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1 Hz
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Common mode rejection ratio is closely related to ?
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A balanced amplifier
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what is the least invasive electrode application?
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subdermal
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A type of amplifier that amplifies the differences in voltage between 2 inputs?
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differential amplifier
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electrode "pop" is induce by what?
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poorly chlorided electrodes
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The time constant is determined by?
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resistance x capacitance
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The laplacian montage is often used for?
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topographic EEG mapping
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time scale of 3 cm/sec, what is the duration in mm for a 10 hz wave?
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3 mm
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The average reference is created by :
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averaging the activity from all or (most) electrodes used.
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High pas filter is:
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eqivelant to low frequency filter
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bipolar montage is best used to:
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localize focal activity
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True or false
The bio cal demonstrates the integrity of the system from patient to instrument. |
True
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Transverse bipolar monitoring is more accurate than longitudinal montage in localizing the activity:
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spreading from temporal to parasagittal region.
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What is the duration of a wave measuing 5 mm, when the 20 mm calibration signal is equal to 200 msec?
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50 msec
(10 x 5mm = 50) |
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Which seizure type (ictal event) least likely shows abnormality?
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?
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