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. 2015 Jun 19;5:11064. doi: 10.1038/srep11064

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Copyright © 2015, Macmillan Publishers Limited

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(A) A schematic of the ultrasound imaging system. Blood is delivered into the vascular phantom with an acoustic absorber to minimize ultrasound artifacts. (B) Typical speckle images of blood flows at different flow rates. Speckle images are obtained by averaging a total of 255 ultrasound images. For easy comparison, the corresponding images with false colors representing the logarithm of signal power in decibels are included. Decibel is calculated by dividing blood signals to water signals. (C) Radial variations of the mean echogenicity of blood flows shown in Fig. 2B. Error bars indicate the standard deviation (n = 255). (D) Variations of mean echogenicity (E) in the center of tube (ranged from −0.25 to 0.25 of normalized radius) according to pseudo shear rate () among four different groups. Error bars indicate the standard deviation (n = 2). (a–d) Ultrasound B-mode images for four different groups at a flow rate of 5 mL/h. (E) Variations of kurtosis (K) in the center of tube according to pseudo shear rate. Error bars indicate the standard deviation (n = 2). Histograms of echo speckle amplitude data (G) of RBCs in autologous plasma at a flow rate of (a) 0.05, (b) 5, and (c) 300 mL/h.

Inline graphic — (A) A schematic of the ultrasound imaging system. Blood is delivered into the vascular phantom with an acoustic absorber to minimize ultrasound artifacts. (B) Typical speckle images of blood flows at different flow rates. Speckle images are obtained by averaging a total of 255 ultrasound images. For easy comparison, the corresponding images with false colors representing the logarithm of signal power in decibels are included. Decibel is calculated by dividing blood signals to water signals. (C) Radial variations of the mean echogenicity of blood flows shown in Fig. 2B. Error bars indicate the standard deviation (n = 255). (D) Variations of mean echogenicity (E) in the center of tube (ranged from −0.25 to 0.25 of normalized radius) according to pseudo shear rate () among four different groups. Error bars indicate the standard deviation (n = 2). (a–d) Ultrasound B-mode images for four different groups at a flow rate of 5 mL/h. (E) Variations of kurtosis (K) in the center of tube according to pseudo shear rate. Error bars indicate the standard deviation (n = 2). Histograms of echo speckle amplitude data (G) of RBCs in autologous plasma at a flow rate of (a) 0.05, (b) 5, and (c) 300 mL/h.