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. Author manuscript; available in PMC: 2011 Jul 20.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Apr;58(4):754–765. doi: 10.1109/TUFFC.2011.1868

Fig. 10.

Fig. 10

Simulated fundamental (top) and harmonic (bottom) ultrasound images of 5 mm anechoic lesions at 3 and 5 cm using delay-and-sum beamforming and a transmit focus at 5 cm. Images are shown for a homogeneous medium (left), an abdominal layer (middle-left), an isoimpedance material (middle-right), and an isovelocity material (right). Images are shown with 50 dB of dynamic range.