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. Author manuscript; available in PMC: 2013 Aug 28.
Published in final edited form as: ACS Nano. 2012 Jul 25;6(8):7489–7496. doi: 10.1021/nn302782y

Fig. 4.

Fig. 4

Comparison of deep embedded objects and their photoacoustic images. Agarose gels containing CuS NP were embedded in a piece of chicken breast muscle, which was then placed under varying numbers of other pieces of chicken breast muscle. Photograph of (A) chicken breast muscle blocks stacked, (B) the cross section of chicken breast muscle where copper sulfide nanoparticles of ➀ 100 μg/mL (2 OD), ➁ 50 μg/mL (1 OD), ➂ 25 μg/mL (0.5 OD), ➃ 12.5 μg/mL (0.25 OD), ➄ 6.25 μg/mL (0.125 OD), ➅ gel without contrast agent, and ➆ two needle tips at center and 11 O’clock position are embedded; Two dimensional photoacoustic image at the depth of (C) ~ 2.5 cm and (D) ~ 5 cm, from laser illuminated surface.