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In an extremely compact imaging system, the far-field-based algorithm still exhibited a better resolution than the point-like-transducer-based algorithm did. The reconstructed image by use of the patch-based algorithm (m = 2) possessed resolution comparable to that by use of the far-field-based algorithm. (a) y-profiles at x = 20 (through the center of the outermost spheres in Fig. 5(a)–(d)). (b) The result of the spatial resolution analysis.
