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. Author manuscript; available in PMC: 2021 Sep 1.
Published in final edited form as: Ultrasonics. 2020 Apr 25;107:106163. doi: 10.1016/j.ultras.2020.106163

Fig. 2.

Fig. 2.

(a) Original micro-vessel image: background noise is clearly visible at depth greater than 40 mm (see white arrows). (b) Power Doppler image of noise obtained by turning off the ultrasound transmission. (c) Micro-vessel image after subtracting (b) from (a), background noise is suppressed at depth greater than 40 mm (see white dashed box). The green dashed boxes represent the region of interests for (a), (b) and (c). The minimum and the maximum dynamic range values of dual-mode images were set as −50 dB and 0 dB, respectively.