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. Author manuscript; available in PMC: 2015 Oct 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2014 Oct;61(10):1698–1708. doi: 10.1109/TUFFC.2014.006502

Fig. 3.

Fig. 3

Pulse sequences of the different modes of the active cavitation technique employed here - “bubble Doppler”. In all cases, Doppler ensemble pulses were transmitted in a flash mode, in which all array elements were excited simultaneously to emit a quasi-plane wave. (a) Color Doppler: one 1-ms HIFU pulse (thin line) was followed by fourteen 3-cycle Doppler pulses (thick grey line). (b) Pulse inversion Doppler: one 1-ms HIFU pulse was followed by fourteen Doppler pulses, and every other pulse was inverted (thick and black lines). (c) Interleaving Doppler: each of the fourteen 200-µs HIFU pulses were followed by a single Doppler pulse. The HIFU-Doppler pulse pair was repeated with a period of 400 µ s.