Key result
A novel array processing technique for bed-based ballistocardiogram systems achieved an average mean absolute error of 1.76 bpm for heart rate estimation, outperforming state-of-the-art methods.
Why the study?
Multi-channel load-cell hospital beds can provide continuous heart rate monitoring, but existing heart rate estimation algorithms needed improvement through optimized information fusion from multiple channels.
Does a novel array processing technique improve heart rate estimation accuracy using a multi-channel load-cell hospital bed compared to existing algorithms?
Does a novel array processing technique improve heart rate estimation accuracy using a multi-channel load-cell hospital bed compared to existing algorithms?
Absolute Event Rate: 1.76% vs 1.91%
A novel array processing technique for bed-based ballistocardiogram systems significantly reduces heart rate estimation error compared to existing algorithms.
The ballistocardiogram (BCG), a cardiac vibration signal, has been widely investigated for continuous monitoring of heart rate (HR). Among BCG sensing modalities, a hospital bed with multi-channel load-cells could provide robust HR estimation in hospital setups. In this work, we present a novel array processing technique to improve the existing HR estimation algorithm by optimizing the fusion of information from multiple channels. The array processing includes a Gaussian curve to weight the joint probability according to the reference value obtained from the previous inter-beat-interval (IBI) estimations. Additionally, the probability density functions were selected and combined according to their reliability measured by q-values. We demonstrate that this array processing significantly reduces the HR estimation error compared to state-of-the-art multi-channel heartbeat detection algorithms in the existing literature. In the best case, the average mean absolute error (MAE) of 1.76 bpm in the supine position was achieved compared to 2.68 bpm and 1.91 bpm for two state-of-the-art methods from the existing literature. Moreover, the lowest error was found in the supine posture (1.76 bpm) and the highest in the lateral posture (3.03 bpm), thus elucidating the postural effects on HR estimation. The IBI estimation capability was also evaluated, with a MAE of 16.66 ms and confidence interval (95%) of 38.98 ms. The results demonstrate that improved HR estimation can be obtained for a bed-based BCG system with the multi-channel data acquisition and processing approach described in this work.
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Jung et al. (2021) studied Heart rate estimation. Novel array processing technique for multi-channel BCG vs. State-of-the-art multi-channel heartbeat detection algorithms was evaluated on Heart rate estimation error (Mean Absolute Error in bpm). A novel array processing technique for bed-based ballistocardiogram systems achieved an average mean absolute error of 1.76 bpm for heart rate estimation, outperforming state-of-the-art methods.
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