Fig. 6.

Experimental results with a multipurpose ultrasound imaging phantom. Results are presented in 25 dB dynamic range log scale. Axes are common to b–n. a Lateral and axial resolution targets. The lateral target was located at depths of 30 mm. The target is composed of 0.8 mm nylon wires, with lateral and axial separation distances in mm of 0.25, 0.5, 1, 2, 3, and 4. White scale bar is 2 mm. b Plane wave reference image. c The result of coherently compounding five plane wave reference images. d Two-way focused reference image. e–i Five emitted pressure fields. The generated pattern is shifted by 0.22 mm between successive images. j–n Corresponding echoed images. o Super-resolution reconstructed image. p Cross section along the lateral resolution target (z = 29.3 mm), for the reference images b–d and the super-resolution image o. Example selected from n = 3 repetitions