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(a) Ultrasound, (b) photoacoustic and (c) thermal image of a subcutaneous tumor in nude mouse. Reprinted with permission from Mallidi S, Wang B, Mehrmohammadi M, et al. Ultrasound-based imaging of nanoparticles: from molecular and cellular imaging to therapy guidance. Proceedings of the 2009 IEEE Ultrasonics Symposium 2009:27–36 (2009) [81].
