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. Author manuscript; available in PMC: 2013 Aug 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2012 Aug;59(8):1729–1740. doi: 10.1109/TUFFC.2012.2377

Fig. 1.

Fig. 1

Illustration of the material and excitation configurations used in this investigation. (a) A stiff vertical layer (E = 20 kPa) with a thickness of 2–10 mm in a soft (E = 5 kPa) background. (b) An example Gaussian excitation used to image the layered models. (c) An example of the experimental excitation configuration described in Table I, that was used in the simulation of a stiff (E = 20 kPa) 10 mm diameter spherical lesion in a soft (E = 5 kPa) background.