Improved Delay-and-Sum Beamforming Algorithm for Breast Cancer Detection

Figure 4

2D focusing results for standard and improved DAS algorithms, for different horizontal planes along the 𝑧-axis: (a) standard DAS (𝑧=−18), (b) standard DAS (𝑧=−27), (c) improved DAS (𝑧=−18), (d) improved DAS (𝑧=−27). 2D contour plots show signal energy on a linear scale, normalised to the maximum in the 3D volume; values below 0.1 are rendered as white.

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