RIU 320 Lecture Notes - Lecture 66: Sonographer, An Angle

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In this case, the angle between the direction of flow and the direction of the sound beam is 90 degrees. 90 degrees is zero, no doppler shift is created or measured, and no color appears in this vessel. An angle other than 90 degrees must be created between the direction of flow and the direction of the sound beam. The cosine of 90 is zero and the cosine changes to a maximum. In images b and c, the color box is steered. The angle value of 1 at zero degrees or a minimum value or -1 at 180 degrees. between flow and sound beam directions is different than 90 degrees, creating color in the lumen of the vessel. No. color will never appear in a vessel when the directions of flow and sound are perpendicular. Therefore, any time a vessel is without color, the first thing to do is check the angle between flow and sound.

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