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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. 17.

Fig. 17

(Top row) Images reconstructed by use of SGD with a constant step size of 2.5 × 105 and regularization parameter values of (a) 1 × 10−10, (b) 3 × 10−10, (c) 1 × 10−9, and (d) 3 × 10−9. (Bottom row) Images reconstructed by use of the weighted RDA method with regularization parameter values of (e) 1 × 10−10, (f) 3 × 10−10, (g) 1 × 10−9, and (h) 3 × 10−9. Images are shown after 100 iterations and in a grayscale window of [1.38, 1.60] mm/μs.