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A, Two-dimensional point spread function (PSF) of the ex vivo photoacoustic imaging probe in the XZ plane. B, Lateral cut (along azimuthal/X-axis) of the 2D point spread function in A. C, Axial cut (along time/Z-axis) of the 2D point spread function in A. The pair of red lines in B and C show the full width half maximum (FWHM) along the lateral and axial directions. The lateral full width half maximum is 2.45 mm, whereas the axial full width half maximum is 0.34 mm.
