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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