Analyzing Data For A Single Test - otometrics ICS Impulse USB User Manual

User Guide
The collection algorithm analyzes the data in real-time as it is being collected. If the head impulse meets the algorithm cri-
teria, an accepted head impulse will be counted in the collection window. A head impulse that matches the training curve
is typically counted as an accepted (valid) head impulse.
Comparing the actual head traces (in this example shown in blue) against the training lines helps ensure that the tester per-
forms quality head impulses and that only good data is included in the analysis.
Note You can find more information in the ICS Impulse training video or at
•
10

Analyzing data for a single test

Analysis of the test results can be viewed in the
For information about switching between viewing modes (normal mode or enlarged mode), refer to the Reference
Manual.
Gain window
Gain is the ratio of the eye movement velocity to the head movement velocity. Individual gains and the mean gain are dis-
Gain
played. The
peak velocity is the maximum velocity for each of the 175 samples representing that particular head impulse test). The
gain graph will auto scale above 1.2 if there are individual gains between 1.2 and 3.
High gain values could be the result of one of these issues or a combination of them:
1. Slippage of the goggles. Make sure the strap is very snug, the cable from the goggles is clipped to the patient's right
shoulder or collar with some slack, and there are not gaps between the foam cushion and the patient's face. For pic-
tures showing good and poor goggles placement, refer to
20
window displays gain values along the Y axis and corresponding peak velocities along the X axis. (The
2D , Hex Plot , or 3D Analysis
Place goggles on patient ► 9
www.icsimpulse.com .
window group.
.
Otometrics - ICS Impulse USB