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Experimental OR-PAM system. (a) Schematic of the OR-PAM system; AMP: amplifier; UT: ultrasonic transducer; BS: beam splitter; AL: acoustic lens; (b) maximum amplitude projection OR-PAM image of a USAF-1951 resolution target; (c) estimation of axial resolution from a typical A-line acquired from USAF-1951 target. SD: shift difference.
