User's Manual

Ultraview Care Network

24-18

Histogram Display

The histogram display is used to set the appropriate scale or size for the DSA

display. This helps to optimize the DSA display contrast. The histogram vectors

should fill as much of the window as possible without saturating. The histogram

display can also be used to see EEG power and frequency changes in each

epoch. It provides expanded information for each column of DSA data. The

histogram display is only accessed when changing the DSA size after processing

has been started.

Figure 24-4: EEG display of histograms (4 channels)

 Amplitude Axis — The vertical, or Y-axis represents the amplitude. The

bottom of the Y-axis is always labeled as 0 uV2 (zero microvolts squared).

The top of the Y-axis is labeled with the maximum power you select. The

power displayed in the above figure (100 uV2) indicates full scale power of

the histogram vectors.

 Frequency Axis — The horizontal, or X-axis represents the frequency range

(0 to 30Hz) and is divided into five equal sections with tic marks.

To change DSA size:

1 Touch EEG.

2 Touch SETUP.

3 Touch DSA.

4 Touch SIZE.

5 Set DSA size.



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