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. Author manuscript; available in PMC: 2021 Feb 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2019 Sep 19;67(2):248–257. doi: 10.1109/TUFFC.2019.2942557

Fig. 3.

Fig. 3.

(a) Location of the 25 virtual sources for diverging waves with a diverging angle of 30°. The origin ‘0’ is located at the center of the matrix array surface and the virtual sources are uniformly distributed in a 5×5 grid over the spherical surface with a radius of 19 mm from the origin. The negative sign on the z-axis represents the virtual space above the transducer surface. (b) The corresponding measured lateral resolution (X-axis) and elevation resolution (Y-axis) is 447 μm and 418 μm, respectively.