Influence of Gravitational Offset Removal on Heart Beat Detection Performance from Android Smartphone Seismocardiograms
Executive Summary
This study evaluates the impact of gravitational offset removal on heart beat detection performance using seismocardiograms (SCG) recorded via Android smartphones. The proposed algorithm employs band-pass filtering, RMS envelope computation, and peak detection to identify heart beats. Results show high detection accuracy (Se = 0.990, PPV = 0.948), with RMS envelope outperforming analytical envelope. Gravitational offset removal had minimal influence due to preprocessing steps, suggesting the algorithm's robustness across axes and conditions.
Answer Machine Insights
Q: Does gravitational offset removal significantly affect heart beat detection performance?
No, gravitational offset removal has an insignificant impact due to band-pass filtering.
We observed insignificant influence of gravitational offset removal on proposed beat detection algorithm because of band-pass signal filtering.
Q: Which envelope type performed better for heart beat detection?
RMS envelope performed better than analytical envelope.
Using RMS envelope improves the detection quality of proposed algorithm, which suggests choosing that type of envelope for next studies.
Key Results
Sensitivity (Se) = 0.990 and Positive Predictive Value (PPV) = 0.948 for all beats.
Using RMS envelope improves detection performance compared to analytical envelope.
Visual Evidence
![Fig. 1. SCG vs. ECG by Ghufran Shafiq et al. Image retrieved from [12]. License: CC-BY 4.0. Part (a) shows raw SCG signal (above) and ECG signal (below). Part (b) presents annotated SCG and ECG ensemble averages (dark lines) and superimposed SCG and ECG beats (light shades).](/_next/image?url=%2Fscience-hub%2Fimages%2F10.1007_978-3-319-91211-0_30%2F10.1007_978-3-319-91211-0_30_p2_i1.jpeg&w=3840&q=75)
Fig. 1. SCG vs. ECG by Ghufran Shafiq et al. Image retrieved from [12]. License: CC-BY 4.0. Part (a) shows raw SCG signal (above) and ECG signal (below). Part (b) presents annotated SCG and ECG ensemble averages (dark lines) and superimposed SCG and ECG beats (light shades).
Clinical Snapshot
Evidence Rating
Relevance
high Priority