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Module Frames and Modules
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delivers its potential to every channel’s minus-input. The signal is the potential difference
between this common reference electrode and the electrode connected to the plus input. The
purpose of the ground electrode is to reduce common mode noise. It cannot be used as a
referential electrode.
Figure 2
EEG measuring principle
The EEG signal is amplified, antialias filtered, digitized and software filtered. After that the EEG
signal is displayed on the screen and various characteristics are calculated from it. These
include spectrum, rms amplitude, spectral edge frequency, median frequency,
burst-suppression ratio and percentage of total power in four different bands: theta (1...4 Hz),
delta (5...9 Hz), alpha (9...13 Hz) and beta (>13 Hz).
1.2.2 FEMG
FEMG is an electrical signal originating from facial muscles. In the headbox, the signal of
channel 1 is divided into two different amplification and filtering paths. One is the EEG path and
the other is the FEMG path. The FEMG signal has a much broader spectrum than the EEG and it
overlaps with the EEG at low frequencies. Because of this, the rms amplitude of FEMG signal is
calculated from the frequency band 60...300 Hz. The mains power frequency and its harmonics
are digitally filtered away to reject noise interference from the power lines.
1.2.3 AEP
AEP is an electrical response of the nervous system to an external auditory stimulus. It is
measured using the same electrodes as in the EEG measurement, but the sampling frequency
and bandwidth are different. The electrical signal resulting from one stimulus is weaker than
the spontaneous activity of the brain. To overcome this, the stimulus is repeated several times
(100...2000), and an average of all responses is calculated. Responses containing large
artefacts are removed from the average to improve the signal to noise ratio.
1.2.4 Impedance measurement
The impedance measurement is performed for one channel at a time and the EEG or EP
measurement is stopped during the impedance measurement.
Differences in electrode impedance cause common mode noise coupling to the measured
signal. To minimize this, the electrode impedance is measured, and a warning of unsatisfactory
impedance level is generated when necessary. The impedance of an electrode is measured by
applying a known current through the electrode and measuring the voltage drop over the
electrode. This way the impedance of a single electrode can be resolved instead of a sum
impedance of an electrode pair.
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Содержание E-PSMP
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Страница 95: ...3 Continuous Cardiac Output Module E PiCCO Technical Manual...
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Страница 125: ...4 Cardiac Output and SvO2 Module E COPSv Rev 01 Cardiac Output Module E COP Rev 01 Technical Manual...
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Страница 207: ...Masimo Module E MASIMO 6 5 2062973 004 2 Configuration There is no configuration for the E MASIMO module...
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Страница 221: ...7 Nellcor Compatible Module E NSAT E NSATX Technical Manual...
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Страница 443: ...12 EEG Module E EEG and EEG Headbox N EEG Technical Manual...
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Страница 495: ...14 NeuroMuscular Transmission Module E NMT Rev 01 Technical Manual...
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