A novel acoustic sensor-based method for measuring pulse transit time shows comparable performance to traditional PPG-based methods, offering a potential alternative for physiological monitoring.
Offers a noninvasive alternative for pulse transit time monitoring; leaves open whether acoustic sensors can reliably replace phot.
This work proposes a novel method of pulse transit time (PTT) measurement. The proximal arterial location data are collected from seismocardiogram (SCG) recordings by placing a micro-electromechanical accelerometer on the chest wall. The distal arterial location data are recorded using an acoustic sensor placed inside the ear. The performance of distal location recordings is evaluated by comparing SCG-acoustic and SCG-photoplethysmogram (PPG) measurements. PPG and acoustic performances under motion noise are also compared. Experimental results suggest comparable performances for the acoustic-based and PPG-based devices. The feasibility of each PTT measurement method is validated for blood pressure evaluations and its limitations are analyzed.
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Yang et al. (2017) studied this question.
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