Red Color on color doppler suggests?
Color Doppler Imaging: Doppler imaging illustrates only the direction of flow, color coded mean velocities and the range of the mean velocities. Blood flowing towards the ultrasound transducer is conventionally depicted in a band of colors ranging from deep red (low velocity) to bright yellow (high velocity). Flow in direction away from the transducer is indicated by band of colors ranging progressively from deep blue (low velocity) to cyan (high velocity).
Aerial Blood
Venous Blood
Flow towards the transducer
Flow Away from the transducer
Cardiovascular Radiology