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Figure 2b: Comparison of color Doppler signals among four flow materials. With degassed water Doppler signals could not be detected on the display at any flow rate (0.3-4.0 ml/s). At 1.0 ml/s no Doppler signal was detected from distilled water or urine. Continuous flow signals were detected using the liposome solution at flow rate 0.3 ml/s or higher. At 2.0 ml/s flow rate, continuous flow signals were obtained from urine and liposome solution

Figure 2b: Comparison of color Doppler signals among four flow materials. With degassed water Doppler signals could not be detected on the display at any flow rate (0.3-4.0 ml/s). At 1.0 ml/s no Doppler signal was detected from distilled water or urine. Continuous flow signals were detected using the liposome solution at flow rate 0.3 ml/s or higher. At 2.0 ml/s flow rate, continuous flow signals were obtained from urine and liposome solution