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future = now > II D digital instrumentation > Flashcards

II D digital instrumentation Flashcards

1
Q

HFF makes muscle artifact look like

A

Beta

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2
Q

evolution

A 
gradual change in 
amplitude
frequency
or spatial distribution of
rhythm
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3
Q

60 Hz

A

Notch filter

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4
Q

common mode rejection

A

ACNS guideline: 90 Db

EEG amplifiers

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5
Q

Common mode rejection

A
  • the ability of an amplifier to reject like signals

- differential amplifier

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6
Q

60 Hz filter has the greatest effect on

A

16 msec waveform

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7
Q

voltage resolution

A

analog to digital converter

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8
Q

time constant

A

LFF

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9
Q

input impedance

A

high

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10
Q

differential amplifier

A

magnifies common-mode voltage difference
differential amplification
info from 2 inputs and amplifying the difference

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11
Q

Nyquist theorem

A

minimum sampling rate
2X the frequency of the highest waves
eX: HFF: 70 Hz min sample rate: 210
ACNS guideline: 3x the HFF

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12
Q

frequency response curve

A

filters

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13
Q

frequency response curve

A

sharpness is determined by the roll off

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14
Q

double the inter-electrode distances

A

higher amplitude

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15
Q

frequency

A

Hz

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16
Q

frequency

A

sampling rate

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17
Q

system gain

A

ratio of amplifiers to output to the input signal

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18
Q

fast Fourier transform

A

converts time function into sine waves of different frequencies

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19
Q

long time constant

A

LF .1 Hz

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20
Q

time constant of .5 sec

A

LF .3 Hz

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21
Q

ground electrode EEG

A

FPz

22
Q

delta wave best seen with filter

A

time constant 1.0 sec

23
Q

voltage resolution

A

analog to digital

24
Q

HFF of 15 Hz, what percent of amplitude is visible?

A

.7

25
Q

time constant for 3 Hz

A

.05 sec

26
Q

sampling rate for HFF of 70Hz

A

210 psec

27
Q

eliminate cortical spikes

A

change HFF from

70 Hz to 15 Hz.

28
Q

3 Hz wave attenuated by what percentage of .3 Hz filter?

A

.3

29
Q

LFF is changed from 1 Hz to 5 Hz.

How is 2 Hz wave affected?

A

significantly attenuated

30
Q

LFF of 5 Hz will attenuate a 5 Hz wave

A

.3

31
Q

time constant for 3 Hz

A

.05 sec

32
Q

.5 Hz was is enhanced without affecting spike with this filter:

A

LFF .3 Hz

33
Q

signals with like frequency, amplitude and phase

A

are canceled

34
Q

vertical resolution

A

amplitude

35
Q

sampling rate

A

a signal sampled at intervals and assigned a numeric value

36
Q

When a 60 Hz sine is sampled at 100 Hz

A

aliasing

37
Q

long time constant

A

LFF .1 Hz

38
Q

A/D converter

A

converts analog signal into digital binary numbers

39
Q

high sampling rates

A

smooth connected lines

40
Q

ACNS guidelines for horizontal resolution

A

16 bits

41
Q

ability for amplifier to reject like signals

A

common mode rejection

42
Q

low sampling rate causes fast frequencies to appear slower

“undersampling”

A

aliasing

43
Q

input 1: +50 muV
input 2: -100 muV
what’s the output voltage and deflection?

A

150 downward

44
Q

Not useful in digital EEG

A

biocal

45
Q

most sensitive

A

2 Uv/mm

46
Q

clipping of the waveforms happens

A

signal is outside of the range of the digitizer

47
Q

EEG amplifiers

A

differential

amplification

48
Q

increasing the # of seconds on monitor

A

No Change in
Spike
amplitude or
duration

49
Q

digital EEG montages are reformatted usijng

A

system reference

50
Q

sensitivity

A

the amount increased by differential amplifier to
magnify
input signal

51
Q

a filter

A

alters the amplitude of frequencies

future = now (9 decks)

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