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. Author manuscript; available in PMC: 2014 May 4.
Published in final edited form as: Opt Lett. 2014 Mar 15;39(6):1473–1476. doi: 10.1364/ol.39.001473

Fig. 2.

Fig. 2

(a) PA B-scan image of the 20 μm thick tungsten wire imaged at three locations. (b) Typical PA A-line signal (blue) and its Hilbert-transformed signal (i.e., radial LSF) for the tungsten wire target located at the focal point (Position 2). (c) Corresponding transverse LSF of the tungsten wire. (d) PA image of a black needle inserted into the inner leg of a rat.