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. Author manuscript; available in PMC: 2020 Feb 1.
Published in final edited form as: IEEE Trans Biomed Eng. 2018 Jun 20;66(2):595–598. doi: 10.1109/TBME.2018.2849077

Fig. 4.

Fig. 4.

Photoacoustic and differential US (ΔUS) images of a capillary tube containing PFHnDs. The images were obtained at different optical wavelengths ranging from 700 nm to 940 nm. Each ΔUS image was generated by taking a difference between first two post-laser ultrasound frames.