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(a) OCT image of the vascular phantom with two inclusions within the wall: methylene blue (MB) within one tube and India ink (II) in another. b) A 2D photoacoustic (PA) circumferential image of the phantom at an excitation wavelength (λexc) of 565 nm. c) The PA amplitude wavelength dependencies for the dyes (MB & II) estimated from PA images of the phantom acquired at multiple wavelengths in the range from 565 nm to 605 nm.
