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(a), (b) Imaging results from the 3-wire target (Dynamic Range of 20 dB). The target phantom with the closest depth of 8 mm, wire spacing of 2.3 mm, and the wire thickness of 0.6 mm was immersed in FC70 (acoustic attenuation ~0.1–0.8 dB/mm/MHz at ~2–5 MHz). (c) improving the first received echo from a target at 6 mm with negative capacitance matching.
