Gain Calculation Methods in vHIT

This webinar discusses the different methods of measuring VOR gain in video head impulse test (vHIT) systems and the benefits of using the gold standard instantaneous gain method.

Timestamps:
0:00 Introduction and learning objectives
2:31 Scleral search coil method
6:26 Instantaneous gain analysis
12:14 Time course of gain in cerebellar disorder
13:48 Regression analysis
15:47 Eye velocity as a function of head velocity
17:15 Normal instantaneous gain
20:38 Reduced instantaneous gain
23:21 Why 60 ms instantaneous gain?
25:50 What is slippage?
28:49 Positional gain in vHIT
33:21 Normal VOR gain
36:30 Reduced VOR gain
37:50 Biphasic slippage
39:10 No biphasic cancellation
41:39 Avoidable artifacts
42:07 Pitfall 1: Delay/phase shift due to loose strap
42:49 Pitfall 2: High gain due to wrong calibration
43:21 Pitfall 3: Eye artifacts
46:11 Pitfall 4: Head overshoot
46:44 Pitfall 5: Slow head stimulation
48:58 Summary of pitfall avoidance
50:03 How to improve vHIT data quality
57:40 Summary
59:07 Q&A

#vHIT #VideoHeadImpulseTest