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. Author manuscript; available in PMC: 2009 Jul 29.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2008 Dec;55(12):2683–2691. doi: 10.1109/TUFFC.2008.983

Fig. 6.

Fig. 6

Pulse-echo test results for the dual element transducer using the 20 MHz outer ring element for transmission and the 40 MHz inner circular element for reception (Option 2: Dout = 12 mm): (a) an echo waveform from the soft silicone rubber target at the focal depth, (b) its spectrum.