User's Manual
EEG
24-15
Density Spectral Array (DSA) EEG Display With Trend
Overlay
Processed EEG is displayed as a Density Spectral Array (DSA) similar to the
pattern shown in the four channel EEG below. The DSA pattern is shown with a
SEF trend overlay.
Data moves from right to left, and is updated every 4-seconds (5-minute time
base).
Figure 24-2: Four-channel DSA EEG display with trend overlay
Real-time Clock — Displays the time the last epoch was acquired.
Time Base — Total time of the DSA plot; ranges from 5- to 40-minutes.
Message Line — The following messages can be displayed: NOT
PROCESSING, REDISPLAYING, REVIEWED, RECALLED.
Electrode Impedance — Electrode impedances are automatically measured
and displayed every 5-minutes after processing is started. If electrode
impedances are greater than the acceptable range (5 K ohms for each
electrode or 2 K ohms differential between the pairs) the impedance values
will flash if the impedance of any electrode exceeds 5 K ohms, or if the
difference between the electrode pairs exceeds 2 K ohms. If the impedance
exceeds 99 K ohms, ++ is displayed.
DSA Magnitude (DSA) — Total magnitude of the EEG in the frequency range
displayed for the last epoch for channels 1 and 2. The number on the left
indicates the left hemisphere magnitude, the right value shows right
hemisphere magnitude.
Overlay Trend Parameter — Numeric value for channels 1 and 2 of either the
Spectral Edge Frequency (SEF), Peak Power Frequency (PPF), or Median
Power Frequency (MPF) for the last epoch displayed. The number on the left
is the frequency for the left hemisphere of the brain, while the right number is
the frequency of the right hemisphere.
Artifact Flag — Artifact detection is marked by lighting a pixel on the top line.
On color monitors, artifacts will be marked with a red pixel.
Event Marker — Used to tag significant clinical events. Can place 52 unique
letters; a-z and A-Z. Used in identifying and recalling stored DSA data.
To display DSA EEG with trend
overlay:
1 Touch EEG.
2 Touch DISPLAY FORMAT.
3 Select DUAL FORMAT OFF.
4 Touch DSA.
5 Touch PREVIOUS MENU.
6 Touch SETUP.
7 Touch DSA.
8 Touch DSA TREND.
9 Select desired trend.
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