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Tissue-mimicking phantom imaging using different systems. (a) Phantom image using single-element transducer and one channel electronics in the annular-array platform, (b) the same phantom image using Vevo 770 40-MHz transducer, (c) beamforming at 5-mm focal point using the annular-array platform, (d) beamforming at 7-mm focal point using the annular-array platform, and (e) phantom image with 4 focal zones using the annular-array platform.
