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Comparison with reference data. (a) Reference data obtained by bidirectional Doppler flowmeter. (b) Measurement data by the developed system with blue light source at radial artery. Since the observed pulse wave was inverted in the developed system, both periods were compared in the minimum values. It was confirmed that the period of the peak value of the blood flow meter (reference) and the peak value of the radial artery were in agreement.
