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System for performing DOS measurements for infantile hemangiomas. (A) Smartphone with a custom-built phone application for system control. (B) Wireless handheld diffuse optical spectroscopy (WH-DOS) device with measurement head circled in yellow. (C) Diagram of measurement head with dimensions. S1–S4 represents light sources at 780, 905, 850, and 808nm. D1 and D2 represent the two detectors with a sensing area of 5.7mm2 used to capture back-reflected light from skin tissue.
