Term
| Which filter settings or most appropriate for the associated channel types? |
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Definition
EEG 0.3/35
EOG 0.1/35
EKG 1.0/35
EMG 10/71 |
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Term
| What is the purpose of the Low Frequency Filter? |
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Definition
| Eliminating undesired slow frequencies |
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Term
| What should technician do first to make sure the proper test is being performed? |
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Definition
| Review the chart for the physician's order |
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Term
| The symbol "G1" represents |
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Definition
| The exploring electrode or the first signal input. |
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Term
| If G1 receives a signal of -100uV at the same time G2 receives a signal of -50uV, what is the output signal? |
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Definition
| -50uV (Output voltages are determined by subtracting G2 from G1. -100--50=-50.) |
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Term
| Which of the following is a process performed by a differential amplifier? |
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Definition
| Recording the differences in the voltages of two inputs. |
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Term
| If G1 and G2 stimultaneously receive an input of 50uV, what is the output signal? |
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Definition
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Term
| The frequency of an EEG signal |
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Definition
| Can be determined by counting the number of waveforms recorded during one second. (Frequency is measured in cycles per second, or Hertz (Hz). |
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Term
| How is the amplitude of a wave determined? |
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Definition
| By comparing the height of the wavefprm against a calibration signal of known value. |
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Term
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Definition
| are performed for a number of purposes, one of which is to produce a wave to use as a measuring standard. |
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Term
| The purpose of a high frequency filter is |
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Definition
| To attenuate undesirable fast frequencies |
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Term
| In polysomnography, what is the sensitivity setting? |
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Definition
| The ratio of input signal voltage to the amplitude of pen deflection. |
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Term
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Definition
| equals input signal voltage divided by pen deflection. |
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Term
| An appropriate EEG sensitivity setting is |
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Definition
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Term
| Amplitude is a measure of |
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Definition
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Term
| Adjusting the sensitivity from 5uV/mm to 10uV/mm will |
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Definition
| Reduce the pen deflection by one half |
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Term
| The standard paper spend used for a sleep study is |
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Definition
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Term
| Which of the following filter settings would be most appropriate for EEG channels on a sleep study? |
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Definition
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Term
| Which of the following filter settings are the most appropriate for recording EMG channels? |
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Definition
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Term
| Which of the following filter settings should be used for recording airflow and respiratory effort? |
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Definition
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Term
| What is a major difference between AC and DC amplifers? |
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Definition
| AC amplifers have a high frequency filter, while DC amplifiers do not |
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Term
| The quality and accuracy of a sleep recording is mostly determined by |
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Definition
| proper electrode application |
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Term
| The purpose of physiologic calibrations is to |
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Definition
- Establish certain scoring references for the sleep study
-Verify signal derivations for each channel
-Confirm the integrity of the signals |
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Term
| The recording of eye movements is based on |
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Definition
| The electrical potential difference between the cornea and the retina. |
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Term
| If the low frequency filter is increased from 0.3Hz to 1Hz in an EEG channel, how will this affect the recording? |
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Definition
| The 1Hz setting will decrease the amplitude of slow waves |
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Term
| Amplitude is a measurement of the____ of a waveform, while frequency is a measurement of the ____of a waveform. |
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Definition
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Term
| EEG ampplitude is measured in____, while EEF frequency is measured in____. |
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Definition
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