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Steady-state NSSA and image intensity of adherent microbubbles with different flow rates. *p < .01. The steady state of adherent microbubbles was obtained by pulling 40 mL microbubble solution with concentration of 0.5 × 106 mL−1 through the fluid channel with acoustic radiation force applied. Arrows showed the control group with no microbubble injection. The results were averaged over 10 trials in different fluid channels.
