natus Otometrics ICS Chartr 200 VNG/ENG, Installation And Startup Manual

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5.7
Step 27
Analyze Slow Phase Velocity (SPV) Measurements
A. Click the
Review
tab and select a Caloric or other test to analyze nystagmus.
B. Press F12 Begin to measure the slow phases and plot them on the lower chart. The number of beats analyzed displays
in the Information area.
C. Use the function keys to work with the results:
Function Keys, during SPV Analysis
F2
Reanalyze Clear previous analysis and begin a new analysis.
F4
Pods - Butterfly
Display pod (summary) and butterfly view of caloric ana-
lysis.
F5
Locate Peak Identifies the second in time with the fastest average
value.
F6
Set Peak
Computes the average of the highest SPVs in the 10-
second window at the current cursor location.
F7
Delete Delete the SPV beat measurement.
F8
Insert
Accept a new SPV value for the beat.
F9
Close Close Analysis
F10
Previous Beat
Move to previous beat.
F11
Next Beat Move to next beat.
F12
Save
Save analysis and return to Review mode.
D. (Optional) Measure the slope of a beat manually.
SPV Analysis
1. Select a beat (A):
– Click and drag the scroll bar or
press the
áâ
arrow keys to
move through the tracing (B).
– Click F10 Previous Beat and
F11 Next Beat to move
through the tracing.
– Click on a beat in the lower
chart or click in the upper chart
to move to that section on the
tracing.
2. Click F7 Delete to delete artifactual
beats
36 Otometrics - ICS Chartr 200 VNG/ENG
5 Review and Analyze Collected Data