Essentials of Polysomnography and
verified correct answers
what filter setting are most appropriate for the associated channel types?
EEG:
EOG:
EKG:
EMG: - correct answers-EEG: 0.3/35
EOG: 0.1/35
EKG: 1.0/35
EMG: 10/70
what is the purpose of the low frequency filter? - correct answers-Eliminating undesired
slow frequencies
The symbol G1 represents... - correct answers-The exploring electrode (first signal
input)
G2 is the second input, or the reference electrode.
What is the process performed by a differential amplifier? - correct answers-Recording
the difference in the voltage of two inputs
What can be determined by counting the number of wave forms recorded during one
second? - correct answers-The frequency of an EEG signal. (Hertz Hz)
How is the amplitude of a wave determined? - correct answers-By comparing the height
of the waveform against a calibration signal of known valve.
The purpose of a high frequency filter is... - correct answers-To attenuate undesirable
fast frequencies.
In Polysomnography, what is the sensitivity setting? - correct answers-The ratio of input
signal voltage to the amplitude of the pen deflection.
What is an appropriate EEG Sensitivity setting? - correct answers-5uV/mm & 50uV/cm
(same setting)
What is Amplitude a measure of? - correct answers-Voltage
What is the standard paper speed used for a sleep study? - correct answers-10mm/sec,
which produces a 30_second epoch.
What filter setting is most appropriate for recording EEG? - correct answers-LFF= 0.3
Hz, HFF= 30Hz
also acceptable:
LFF= 1Hz, HFF= 30Hz
What filter setting is most appropriate for a recording EMG channels? - correct answers-
LFF= 10 Hz, HFF=100Hz
The HFF can be set to at least 70Hz, & the LFF should be set at or close to 10Hz.
What filter setting should be used for recording AirFlow & respiratory effort? - correct
answers-LFF= 0.1, HFF= 0.5
However, normal6the HFF would be set slightly higher than this.
verified correct answers
what filter setting are most appropriate for the associated channel types?
EEG:
EOG:
EKG:
EMG: - correct answers-EEG: 0.3/35
EOG: 0.1/35
EKG: 1.0/35
EMG: 10/70
what is the purpose of the low frequency filter? - correct answers-Eliminating undesired
slow frequencies
The symbol G1 represents... - correct answers-The exploring electrode (first signal
input)
G2 is the second input, or the reference electrode.
What is the process performed by a differential amplifier? - correct answers-Recording
the difference in the voltage of two inputs
What can be determined by counting the number of wave forms recorded during one
second? - correct answers-The frequency of an EEG signal. (Hertz Hz)
How is the amplitude of a wave determined? - correct answers-By comparing the height
of the waveform against a calibration signal of known valve.
The purpose of a high frequency filter is... - correct answers-To attenuate undesirable
fast frequencies.
In Polysomnography, what is the sensitivity setting? - correct answers-The ratio of input
signal voltage to the amplitude of the pen deflection.
What is an appropriate EEG Sensitivity setting? - correct answers-5uV/mm & 50uV/cm
(same setting)
What is Amplitude a measure of? - correct answers-Voltage
What is the standard paper speed used for a sleep study? - correct answers-10mm/sec,
which produces a 30_second epoch.
What filter setting is most appropriate for recording EEG? - correct answers-LFF= 0.3
Hz, HFF= 30Hz
also acceptable:
LFF= 1Hz, HFF= 30Hz
What filter setting is most appropriate for a recording EMG channels? - correct answers-
LFF= 10 Hz, HFF=100Hz
The HFF can be set to at least 70Hz, & the LFF should be set at or close to 10Hz.
What filter setting should be used for recording AirFlow & respiratory effort? - correct
answers-LFF= 0.1, HFF= 0.5
However, normal6the HFF would be set slightly higher than this.
