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Workflow of Blood oxygen accumulation distribution area index (BOADAI). (A) The photochemistry signals of oxygen saturation were recorded automatically and translated into digital image signals (SpO2 curve); (B) Step 1, the whole pulse oxygen saturation curves during the sleep time were automatically compressed into a fixed scale image; (C) Step 2, The oxygen saturation curves distribution were outlined (turquoise curve) and calculated by Image Pro Plus software; Time bar = 30 min.
