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Change in oxygen saturation (sO2) in a finger due to arterial occlusion. (a) sO2 processing procedure. (b) Consecutive (i) sO2, (ii) vessel mask, and (iii) masked sO2 images during 400 s with a brachial cuff. The blue and red vessel masks indicate nail- and hand-side blood vessels, respectively. (c) Change in sO2 values of the nail- and hand-side blood vessels over time. The error bar represents the standard error of the averaged sO2 of the blood vessels in the vessel masks.
