Position time curve drawing method and system, head impulse test evaluation method and system

Abstract

The invention discloses a position-time curve drawing method and system, and a head impulse test evaluation method and system. By obtaining the patient's eye movement position and head movement speed in the same time period, the head movement speed is converted into the head movement position frame by frame; According to the obtained head movement position and the obtained eye movement position, the position-time curve of eye movement and head movement is drawn; compared with the commonly used method of using velocity-time curve, it can more intuitively and accurately reflect the results of the video head impulse test ; Make the error caused by improper operation such as eye mask sliding clear at a glance; Calculate the gain value through the position-time curve of eye movement and head movement. The obtained gain value is more accurate and fits the actual situation better.

Description

technical field [0001] The invention relates to the technical field of medical experiment data processing, in particular to a position-time curve drawing method and system, and a head impulse test evaluation method and system. Background technique [0002] Head Impulse Test (HIT) is a commonly used auxiliary diagnostic method for clinical examination of semicircular canal function. During the test, the subject's eyes were fixed on a fixed target, and the head was shaken at a small angle and quickly. Under the action of the vestibulo-ocular reflex (VOR), the eyeballs of those with normal functions will be able to , turn the head at exactly the same angle but in the opposite direction to counteract the head movement so that the visual target is still clearly projected on the sensitive area of ​​the retina (fovea), thereby maintaining visual stability. For patients with functional defects, when the head is shaken, the eyeballs move too slowly to counteract the head movement, a...

AI Technical Summary

Problems solved by technology

VOR is a fast reflex, but there is still a delay of 8-12ms. In order to make up for this delay, the eyeball moves a little faster than the head when using VOR to calculate, so the gain value obtained may be greater than 1. Other geometric factors may also cause imprecise results

In the prior art, the results of the video head impulse test are mainly evaluated based on the ratio of eye movement speed to head movement speed, but in this evaluation method, the ratio of eye movement speed to head movement speed of normal people will also be higher than 1. It can be seen that this calculation method is inaccurate and prone to misjudgment

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