Fig. 3. (Color online) An analysis of the results of a prior clinical study on children to investigate the characteristics of SPBFV measured with two PPGs. (a) 9 years old elementary school student wearing PPG-1 and PPG-2 on the wrist and middle finger, respectively. (b) The PPG-1 waveform measured from the wrist shows 9 periodic waveforms for 5.5 s, and the PPG-2 waveform measured from the middle finger has the same periodic waveform for the same time and the time difference between peak values is Δτi(i=1,2,3,4,5). (c) A 14-year-old middle school student wearing PPG-1 and PPG-2 on the wrist and middle finger, respectively. (d) The PPG-1 and PPG-2 waveforms measured from the wrist shows 6 periodic waveforms over 5.5 s with the time difference between peak values being Δτi(i=6,7,8,9,10).
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