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. Author manuscript; available in PMC: 2019 Oct 1.
Published in final edited form as: IEEE Trans Biomed Circuits Syst. 2018 Sep 20;12(5):1100–1111. doi: 10.1109/TBCAS.2018.2871470

Fig. 5.

Fig. 5.

Calculated ηfocus,TX vs. frequency for 3 different a and for depths of (a) 6 cm and (b) 10 cm with an ARX of 1 mm2. Solid line is optimized with FP and dash line is with GM. For the FP method, the TX with a = 1.0 cm for a depth of 10 cm is not able tofocus for lower frequencies; ηfocus,TX for a plane transducer is also shown in (b). Simulated ηfocus,TXfor a = 2.0 cm are plotted with diamond (FP) and circle (GM) markers.