Abstract
Pulse transit time (PTT) is an important physiological parameter that directly correlates with the elasticity and compliance of vascular walls and variations in blood pressure. This paper presents a PTT estimation method based on photoplethysmographic imaging (PPGi). The method utilizes two opposing cameras for simultaneous acquisition of PPGi waveform signals from the index fingertip and the forehead temple. An algorithm for the detection of maxima and minima in PPGi signals was developed, which includes technology for interpolation of the real positions of these points. We compared our PTT measurements with those obtained from the current methodological standards. Statistical results indicate that the PTT measured by our proposed method exhibits a good correlation with the established method. The proposed method is especially suitable for implementation in dual-camera-smartphones, which could facilitate PTT measurement among populations affected by cardiac complications.
Highlights
Pulse transit time (PTT) is the time required for a pulse wave to travel from one arterial site to another, and it can serve as a measure of the mean pulse wave
This paper presents a method for PTT estimation that uses two opposing cameras, acquiring photoplethysmographic imaging (PPGi) signals simultaneously, one from the index fingertip and the other from the skin surface at the forehead temple
We suggested an efficient method for estimation of PTT based on PPGi signals captured from two microcameras
Summary
Pulse transit time (PTT) is the time required for a pulse wave to travel from one arterial site to another, and it can serve as a measure of the mean pulse wave. It is well known that PTT is highly correlated with the elasticity, compliance, and rigidity of vascular walls [1], left ventricular ejection time [2], and blood pressure variations [3,4]. The conventional method of acquiring PTT combines an electrocardiographic (ECG) signal and a photoplethysmographic (PPG) signal, i.e., ECG-PPG principle [11]. The ECG part of this technique requires the use of at least three wet adhesive Ag/AgCl ECG electrodes. The long time monitoring using such electrodes, and their cost appear as disadvantages of the ECG-PPG technique
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