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Spectroscopic PA images of the peri-adventitial adipose tissue from a porcine aorta segment. (a)-(g) Representative PA B-scan images from 1690 nm to 1778nm. (h) Experimental PA spectroscopic result and optical absorption spectrum [37] of peri-adventitial adipose tissue. (i) Distribution of adipose concentration mapping by correlation calculation. (j) Phantom photograph. Scale bar: 1 mm
