RIU 320 Lecture Notes - Lecture 67: Yellow Arrow, Sonographer, Five Techniques
19 Jun 2020
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The flow streams closer to the vessel walls are red, Aliasing is present in the color doppler image in image a. Image b is a zoomed image of the flow in the artery (upper vessel). The control flow system is blue, indicating flow toward the transducer, or from right to left (blue arrow) indicating flow away from the transducer, or from left to right (red arrow). It is unlikely that there is flow in different directions within a single vessel. Aliasing should be considered as a possible source of this peculiar color variation, whenever the color changes directly from red to blue or vice versa. How can we distinguish bidirectional flow from aliasing with color. Two identical color maps are displayed in fig. On map a, an arrow passes through the center of the map. When using the color map, flow reversal is present in a vessel when the colors red, black, and blue are next to each other.
