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Schematic illustrations of PAM. (A) Scanning mechanism of PAM. (B) PA MAP image generation from volumetric data. (C) The optical and acoustic foci in OR-PAM and AR-PAM. PA, photoacoustic; PAM, photoacoustic microscopy; US, ultrasound; MAP, maximum amplitude projection; OR-PAM, optical-resolution PAM; AR-PAM, acoustic-resolution PAM.
