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. Author manuscript; available in PMC: 2019 Jan 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2018 Jan;65(1):30–38. doi: 10.1109/TUFFC.2017.2773495

Fig. 8.

Fig. 8

Results of the lesion phantom experiment with various beamforming. (a) Conventional dynamic receive beamforming with dense focused transmit beam sampling (0.25 degree spacing, 241 transmissions, 40 mm focal depth). The white dashed ellipses indicate regions of interest for contrast measurement. (b) Proposed method for recovery and beamforming of the complete data set with sparse transmit beam sampling (1 degree spacing, 61 transmissions). (c) Single element transmissions, directly sampling the complete data set (64 transmissions). (d) Hadamard coding of the transmit aperture (64 transmissions). The dynamic ranges of the images were matched as described in the text.