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. Author manuscript; available in PMC: 2014 Mar 20.
Published in final edited form as: Am J Phys. 2013 Sep 1;81(9):712. doi: 10.1119/1.4816242

Fig. 4.

Fig. 4

The normalized PA signal strength as a function of the horizontal position of the sample relative to the co-axis of the laser beam and the UST. The data were obtained with a 1 MHz (dashed curve) and a 2.25 MHz (solid curve) UST. The dashed vertical lines show the inner diameters and the solid vertical lines show the outer diameters of the phantom tube that is filled with 0.5 g/L ICG solution at a depth of 1.9 mm in a 1% intralipid solution. The diameter of the collimated laser beam is ~1.0 mm. The error bars represent the standard deviation of 4 measurements.