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Figure 2: Color flow imaging (a) shows the direction of flow - blue in internal jugular vein (IJV) and red in common carotid artery (CCA). Power Doppler imaging (b) reflects only the strength of signals in one single color. Note that both IJV and CCA show the same color on power Doppler imaging. Note the pulse repetition frequency (PRF) in panel (c) is 5. Increasing PRF to 20 corrects the aliasing artifact as shown in panel (d)

Figure 2: Color flow imaging (a) shows the direction of flow - blue in internal jugular vein (IJV) and red in common carotid artery (CCA). Power Doppler imaging (b) reflects only the strength of signals in one single color. Note that both IJV and CCA show the same color on power Doppler imaging. Note the pulse repetition frequency (PRF) in panel (c) is 5. Increasing PRF to 20 corrects the aliasing artifact as shown in panel (d)