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. Author manuscript; available in PMC: 2018 May 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2017 Mar 14;64(5):811–825. doi: 10.1109/TUFFC.2017.2682061

Fig. 5.

Fig. 5

Images reconstructed by the unweighted RDA method with a fixed step size of 0.1 for regularization parameter values of (a) 1 × 10−5, (b) 5 × 10−5, (c) 1 × 10−4, and (d) 5 × 10−4, shown after 300 iterations. All images are shown in a grayscale window of [1.47,1.58] mm/μs.