Effect of dual-frequency clutter suppression in harmonic Doppler detection

► Dual-frequency clutter suppression was studied in a swept-scan high-frequency system. ► 3f0 transmit phasing provides mutual cancellation the tissue harmonic clutter signal. ► The cut-off frequency of wall filtering can be reduced without sacrificing SCR. ► More low-velocity flow signal is preserved and the Doppler sensitivity improves.