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

A technology of time curve and pulse test, which is applied in the field of medical experiment data processing, can solve the problems of inaccurate results, easy misjudgment, inaccurate calculation methods, etc., and achieve the effect of high calculation accuracy and accurate gain value

Active Publication Date: 2021-05-14
SHANGHAI ZEHNIT MEDICAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0064] As shown in Fig. 3(a), in this embodiment, the speed-time curve of the normal person is the result of the video head impulse test. Figure 3(b) shows the results of the video head impulse test of the position-time curve of normal people; one curve in the figure is the head movement curve, the other curve is the eye movement curve, and the vertical line represents the interval index of the calculated gain value ; Figure 3(b) shows that the gain value calculated from the position-time curve in this case is 1.02, which is 12.7% smaller than the gain value 1.15 calculated from the speed-time curve in Figure 3(a), and is closer to 1.

Embodiment 2

[0066] Figure 4(a) shows the results of the video head impulse test of the velocity-time curve of patients with vestibular function, and Figure 4(b) shows the results of the video head impulse test of the position-time curve of patients with vestibular function; another preferred method can be used A color marks a detected eye-curve saccade by means of which a vestibular impairment in the patient can be identified. The gain value of 0.59 calculated from the position-time curve in this case is 13.5% smaller than the gain value of 0.67 calculated from the velocity-time curve. It can be seen that the gain value of the position-time curve can more significantly reflect the abnormal vestibular function of the patient.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/113
CPCA61B3/113
Inventor 庄建华李文妍李华伟屈寅弘欧阳溢罗旭于艳山柯玛庭
Owner SHANGHAI ZEHNIT MEDICAL TECH CO LTD
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