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. Author manuscript; available in PMC: 2018 Jul 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2017 May 8;64(7):1078–1086. doi: 10.1109/TUFFC.2017.2702010

Fig. 6.

Fig. 6

Phantom and imaging data used for assessing CTR as a function of varying depth with the developed transducer. (A) A tissue-mimicking phantom having attenuation of 0.4 dB/cm/MHz was imaged in (B) B-mode (transmit and receive 20 MHz), (C) dual-frequency mode before the injection of microbubbles (transmit: 4 MHz, receive: 20 MHz), and (D) dual-frequency mode after the injection of microbubbles. The ‘+’ indicates the transducer position. Depths of wall-less channels containing microbubbles are indicated in (A) and (D).