Motion artifact mitigation in seismocardiography and gyrocardiography
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Solution Overview
Problem
Inertial sensors used in seismocardiography and gyrocardiography are highly susceptible to motion artifacts, which interfere with the accurate tracking of heart rate due to activities such as walking or sitting, leading to degraded signal quality and making direct heart rate calculations impossible.
Innovation Solution
A method and system that combines multiple measured motion signals from different directions, employing filters and adaptive algorithms to suppress motion artifacts while preserving cardiac signals, including techniques like linear filtering, whitening, notch filtering, and covariance matrix-based filtering to generate accurate cardiac motion signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inertial sensors are used to monitor biomarkers, then heart rate tracking capability is provided, but motion artifacts degrade signal quality and make direct heart rate calculations impossible
Solution Approach 1:
The motion signal is segmented into multiple directional components (first direction and second direction perpendicular to the first). By processing these segmented components separately and combining them, the system isolates cardiac motion signals from motion artifacts, thereby improving signal quality while maintaining heart rate tracking capability during subject motion.
2Reliability
If multiple measured motion signals from different directions are combined, then motion artifact suppression is achieved, but processing complexity increases
Solution Approach 1:
The system transitions from single-directional signal processing to multi-dimensional processing by incorporating motion signals from at least two perpendicular directions. This dimensional expansion enables the system to differentiate between cardiac motion (which produces characteristic patterns across multiple axes) and random motion artifacts, thereby improving heart rate tracking accuracy while using standard inertial sensor capabilities.
Data Source
AI summary
A system and method for motion artifact mitigation in seismocardiography and gyrocardiography. In some embodiments, a method includes: obtaining a first measured motion signal from a subject, the first measured motion signal being measured along a first direction; obtaining a second measured motion signal from the subject, the second measured motion signal being measured along a second direction different from the first direction; and generating a first calculated cardiac motion signal, the generating including combining the first measured motion signal and the second measured motion signal.