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Photoacoustic monitoring of arterial pulsation based on the axial position displacement of the blood vessels in a finger. Photoacoustic B-mode of the finger during systole (a) and diastole (b). (c) Axial position displacement of the blood vessels over time. (d) Frequency response of the axial position displacement. The dominant frequency, 1.21 Hz, represents a pulsation at 72.6 beats per minute. All scale bars are 200 μm.
