natus Olympic Brainz Monitor, Справочное руководство

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Introduction
BRM2 Brain Monitor Reference Manual | 3
Terms and abbreviations
The following table contains the terms and abbreviations used on the BRM2 Brain Monitor and its
packaging, or in this manual and other documentation.
Term or Abbreviation Meaning
Amplitude-integrated
electroencephalograph (aEEG) A time-compression technique for presenting long EEG recordings,
using an asymmetrical filter, peak detector, rectifier and semi-
logarithmic amplifier.
Amplitude A measurement of the level of brain activity detected as an electrical
signal, measured in microvolts (
μ V) peak-to-peak.
Artifact Any electrical signal detected by an EEG machine from an extra-
cerebral source (for example, electrode or cable movement, AC supply
noise, ventilator noise).
Channel A complete system for the amplification and conditioning of electrical
signals from a pair or combination of electrodes.
DAU (Data Acquisition Unit) The DAU serves as the interface between the low-level analog signals
detected by the Sensor Set and the digital processing software of the
Monitor. The DAU is normally positioned close to the patient, often
hung at the side of an incubator or cot.
Electrode Conductor applied over, or inserted into, a region of the scalp or brain
to detect electrical activity of the brain.
Electroencephalograph (EEG) Medical electrical equipment intended for production of graphic
recordings and/or a visual display of electrical activity of the brain.
Electromyography (EMG) Electrical activity associated with muscle movement.
Frequency The number of complete cycles of repetitive waves in one second,
measured in hertz (Hz).
Impedance The opposition to the flow of an electric current through a conductor
giving a measurement of the quality of contact between the electrode
and scalp, measured in kOhms.
Intensity A measurement of the electrical energy present in the frequency band
of interest.
Isolation Unit (ISO) The ISO contains the medical isolation circuitry used to protect both
patient and instrument in the unlikely event of an electrical fault. The
ISO is attached to the back of the Monitor.
Reference Electrode An electrode used as a reference point for the suppression of
interfering signals detected by other electrodes or their cables.
Sagital Suture A serrated line on the top of the skull that marks the junction of the
two parietal bones.
Spectral Edge Index (SEI) A measurement of the EEG power spectrum. Also known as Spectral
Edge Frequency .
Tragus The prominence in front of the external opening of the ear.