Assess ECG Signal Quality Per Channel

Computes per-channel signal quality metrics for ECG data stored in a PhysioExperiment object. When detected R-peak locations are provided the signal-to-noise ratio is estimated from QRS vs.\ baseline power; otherwise a variance-based estimate is used.

Usage

ecgSignalQuality(x, peaks = NULL, assay_name = NULL)

Arguments

x

A PhysioExperiment object with ECG data.

peaks

Optional data.frame of detected R-peaks as returned by ecgDetectRpeaks, with at least columns channel and sample.

assay_name

Name of the assay to use. If NULL the default assay is used.

Value

A data.frame with one row per channel and columns:

channel

Integer channel index.

snr_db

Signal-to-noise ratio in decibels.

baseline_wander

RMS amplitude of the low-frequency drift.

saturation_ratio

Fraction of samples within 1\ min or max.

quality_score

Composite quality score in the range [0, 1], where 1 indicates excellent quality.

References

Clifford, G.D., Azuaje, F. & McSharry, P.E. (2006). Advanced Methods and Tools for ECG Data Analysis. Artech House.

Shaffer, F. & Ginsberg, J.P. (2017). "An overview of heart rate variability metrics and norms." Frontiers in Public Health, 5, 258. doi:10.3389/fpubh.2017.00258

See also

ecgDetectRpeaks for R-peak detection, ecgBaselineCorrect for baseline wander correction, ecgQualityCheck for ectopic beat detection.