Speckle Vibrometry for Instantaneous Heart Rate Monitoring
Instantaneous heart rate (IHR) has been investigated for sleep applications, such as sleep 1 apnea detection and sleep staging. To ensure the comfort of the patient during sleep, it is desirable for 2 IHR to be measured in a contact-free fashion. In this work, we use Speckle Vibrometry (SV) to perform 3 on-skin and on-textile IHR monitoring in a sleep setting. Minute motions on the laser-illuminated 4 surface can be captured by a defocused camera, enabling the detection of cardiac motions even on 5 textiles. We investigate supine, lateral, and prone sleeping positions. Based on Bland-Altman analysis 6 between SV cardiac measurements and electrocardiogram (ECG), with respect to each position, we 7 achieve the best limits of agreement with ECG of [-8.65, 7.79] bpm, [-9.79, 9.25] bpm, and [-10.81, 10.23] 8 bpm respectively. The results indicate the potential of using Speckle Vibrometry as a contact-free 9 monitoring method for instantaneous heart rate in a setting where the participant is allowed to rest 10 in a spontaneous position while covered by textile layers.
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Speckle Vibrometry for Instantaneous Heart Rate Monitoring
S. Que, F.B. van Meulen, W. Verkruysse, M. van Gastel, S. Overeem, S. Zinger, and S. Stuijk.
In Sensors, 2023, to appear. MDPI, USA, 2023. (abstract, pdf, doi).