Signal magnitude curves of adherent microbubbles in control (blue) and targeted (red) phantom channels at different PRF of ARF pulses, (a) GPRF1 and (b) GPRF2. Blue dash-dot and red solid lines indicate the mean values from 10 trials. Light color shadows indicate the corresponding error bars at the range of [mean ± standard deviation]. (c) The Rresid parameter for groups of GP5 (reference group), GPRF1, and GPRF2. Boxes (empty for control and filled for targeted phantom channels) show the range of [mean ± standard deviation]. Black lines located at the center of the boxes show the corresponding mean value from 10 trials. Raw data from 10 trials are shown as solid dots overlaid with corresponding boxes. For Student’s t-test, +p< 0.05, *: p < 0.001, n = 10.