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Average image contrast between adherent microbubbles and vessel wall, tissue, and free microbubbles for B-mode, Harmonic + IIR, PI + IIR, and SiSTM imaging techniques. Error bars represent standard deviation of contrast results over 4 trials. Statistical significance between SiSTM imaging and other imaging techniques denoted by ** (p < 0.001) and *** (p < 0.0001) respectively.
