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VHIT : New High Speed Video Head Impulse Test


The Video Head Impulse Test (VHIT) is used to identify unilateral and bilateral vestibular deficits using examiner applied small amplitude head thrusts.

The Video Head Impulse Test (vHIT) has been used for years to identify vestibular. Using unpredictable, examiner applied, rapid horizontal head movements while observing compensatory catch up saccades indicative of a vestibular loss in the stimulated semicircular canal.

Today, DIFRA has developed a high speed camera (250Hz) with built-in 3D gyroscope and 3D accelerometer making much easier to measure VOR gain and record corrective saccades.

Highlights :

  • Very light and comfortable, our HeadStar has no sleepage problems, so we have no limitation for the maximum speed of the impulse compared to some competitors.
  • Optionally, the HeadStar can also be used as a regular monocular VNG system . Thank's to the high resolution camera.
  • With the built in 3D gyroscope, there is no need to change any parts of the device between horizontal testing and anterior/posterior testing.
  • An automatic detection of correct head impulses is implemented in the software to help the user during testing.
  • Video recording is possible with a slow motion replay for each impulse.
  • Assess all six semicircular canals
  • Head Impulse Test is the only test available to assess all six semicircular canals (lateral, anterior and posterior).
  • 2D/3D analysis and normative data
  • View analysis in 2D or 3D. Both display a gain graph with built-in published normative data. A clear 3D picture facilitates easy identification of saccades. Comparison of test sessions allows for validation of vestibular rehabilitation success.
  • Due to sophisticated camera, smaller head impulses of only 15 to 20 degrees are used, making the test more pleasant for the patient.
  • Both overt and covert saccades can be detected allowing for proper diagnosis and rehabilitation recommendations.