Video 1.

Fusion movie ($\mathrm{US}+\mathrm{PA}$) of manipulating targeted beads in $12\mathrm{ml}/\min$ flow stream (MPEG, 3.89 MB) [URL: http://dx.doi.org/10.1117/1.JBO.17.10.101517.1]. The movie has a different frame rate (frames per second) in different sections: section $0:00\sim 3:00$, move the magnet downflow (to left), 150 frames per second; section 3:00 to 5:00, magnet stays at $-0.5\mathrm{mm}$ in lateral position, 300 frames per second; section 5:00 to 12:25, move the magnet upflow (to right) and then downflow to the middle ($-0.2\mathrm{mm}$ in lateral position), 150 frames per second; section $12:25\sim \mathrm{end}$, release the magnet, 10 frames per second. Note that all fusion images were originally acquired at a 4 Hz frame rate.