Fig. 5: Vascular occlusion tests on veins. | Nature Communications

Fig. 5: Vascular occlusion tests on veins.

From: A flexible optoacoustic blood ‘stethoscope’ for noninvasive multiparametric cardiovascular monitoring

Fig. 5

a Photograph of the outlined dorsal venous network, in which the image region is denoted with a white dotted box. b Photograph of the OBS worn on the hand. c The trend lines of peak-to-peak values of the OA signals from the OBS. d Snapshots of 3D vascular images at 20 s, 70 s, 120 s, and 170 s with the dashed line showing the venous network contour. e The comparison of peak amplitude and volume ratios under different pressures. Both the peak amplitudes and volumes decreased along with the reduction of occlusion pressure (Amp for amplitude, Vol for volume, data are presented as mean values ±s.d.). f the linear correlation between OBS-measured peak amplitude ratio changes and ultrasound-measured venous volume ratio changes under different cuff pressures (n = 3 independent experiments, data are presented as mean values ±s.d). Source data are provided as a Source Data file.

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