VORgain Calculation Using Saccade Subtraction for Accurate Vestibular Analysis
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Solution Overview
Problem
The Video Head Impulse Test (vHIT) faces challenges in accurately measuring semicircular canal functions due to artifacts from slippage and noise, particularly affecting the VORgain calculation, which is not adequately considered in relation to angular velocity.
Innovation Solution
An analysis system and method that acquire and analyze vestibulo ocular reflex data by subtracting catch-up saccade angles from head position angles, using the ratio of integral angular velocities of the head and eyes to calculate VORgain, and account for angular velocity variations, providing a more accurate assessment of semicircular canal functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the direct method is used to calculate VORgain from angular velocity ratios, then the test can be performed easily and quickly, but the measurement precision deteriorates due to slippage-induced artifacts and noise artifacts
Solution Approach 1:
The patent extracts and removes the harmful components (slippage-induced artifacts and noise artifacts) from the angular velocity data before calculating VORgain. By identifying and eliminating these artifacts through signal processing techniques, the system maintains the ease of vHIT testing while significantly improving measurement precision.
Solution Approach 2:
The patent introduces an intermediary signal processing step between data acquisition and VORgain calculation. This intermediary processing layer filters out artifacts and noise, acting as a mediator that protects the final measurement from contamination while allowing the simple vHIT test procedure to remain intact.
2Device complexity
If the direct method is used to calculate VORgain, then the analysis process is simple, but the reliability deteriorates because VORgain is noticeably affected by artifacts
Solution Approach 1:
The patent performs preliminary action by preprocessing the angular velocity data to remove artifacts and noise before the VORgain calculation is performed. This preliminary cleaning step ensures that the subsequent simple calculation yields reliable results, maintaining both simplicity and reliability.
Solution Approach 2:
The patent converts the harmful artifacts and noise in the data into identifiable patterns that can be systematically removed. By recognizing the characteristics of these harmful signals, the system transforms them from obstacles to guides for improving data quality, thereby enhancing reliability without complicating the overall process.
3Ease of operation
If VORgain is calculated without considering angular velocity, then the test is straightforward, but the measurement precision deteriorates because VORgain may decline as angular velocity increases
Solution Approach 1:
The patent applies dynamics by making the VORgain calculation adaptive to the angular velocity conditions. Instead of using a fixed calculation method, the system dynamically adjusts the analysis based on the angular velocity magnitude, ensuring accurate VORgain measurement across different test intensities while maintaining procedural simplicity.
Solution Approach 2:
The patent changes the parameters used in VORgain calculation based on angular velocity conditions. By modifying calculation parameters according to the test intensity, the system maintains measurement precision across varying angular velocities without complicating the overall test procedure.
Data Source
AI summary
To provide an analysis system for analysis of semicircular canal functions with rotational stimuli. The analysis system includes a vestibulo ocular reflex data-acquiring unit configured to acquire first vestibulo ocular reflex data and second vestibulo ocular reflex data. The first vestibulo ocular reflex data is acquired by dividing a rotation angle owing to a vestibulo ocular reflex with a rotation angle of a head position. The second vestibulo ocular reflex data is acquired by subtracting at least a rotation angle owing to catch-up saccades (CUS) from the rotation angle of the head position to determine a residual rotation angle, followed by dividing the residual rotation angle with the rotation angle of the head position. The analysis system is configured to analyze semicircular canal functions based on the second vestibulo ocular reflex data, or based on both the first vestibulo ocular reflex data and the second vestibulo ocular reflex data.