Key result
Dual-adaptive DCT substantially improves ECG baseline wander removal over previous methods while preserving clinical information.
Why the study?
Fully removing baseline wander while preserving original clinical information is challenging because baseline wander is usually mingled with low-frequency ECG components.
Does a dual-adaptive approach based on discrete cosine transform improve the removal of baseline wander in ECG records compared to previous methods?
Does a dual-adaptive approach based on discrete cosine transform improve the removal of baseline wander in ECG records compared to previous methods?
Answers are grounded in this paper and cite their sources.
A novel dual-adaptive approach based on discrete cosine transform improves the removal of baseline wander from ECG signals, potentially enhancing the accuracy of automated and manual ECG interpretation.
Removal of baseline wander (BW) is an important preprocessing step before manually or automatically interpreting electrocardiogram (ECG) records. It is a challenging issue to fully remove BW while preserving original clinical information because BW is usually mingled with low-frequency ECG components. A dual-adaptive approach based on discrete cosine transform (DCT) is presented in this study. Firstly, the cardiac fundamental frequency (CFF) of ECGs is accurately calculated through DCT domain analysis. Secondly, DCT coefficients of ECGs, whose frequencies are below CFF, are used to construct an amplitude vector in which the optimal cut-point between BW and ECGs is distinctly reflected. Finally, a new filtering technique based on DCT is exploited to suppress BW with its cutoff frequency adjusted to the optimal cut-point. The proposed method is applied to both real ECG records and simulated ECGs with its results compared to those of three previous methods published in the literature. The experimental results show that substantial improvements in performance can be achieved when adopting this dual-adaptive approach.
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Lin et al. (2022) studied ECG baseline wander. Dual-adaptive approach based on discrete cosine transform (DCT) vs. Three previous methods published in the literature was evaluated on Removal of baseline wander while preserving original clinical information. A dual-adaptive approach based on discrete cosine transform achieved substantial improvements in removing ECG baseline wander compared to three previous methods.
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