In color Doppler displays, which color typically represents positive Doppler shifts?

In color Doppler displays, which color typically represents positive Doppler shifts?

• A. Blue
• B. Red
• C. Green
• D. Yellow

Answer: (B)

Color Doppler maps encode flow direction relative to the transducer, with positive Doppler shifts representing flow toward the transducer. The standard convention is that toward the transducer is shown in red, so red indicates a positive shift. Flow away from the transducer yields a negative shift and is usually shown as blue. Green or yellow can appear in some systems for other purposes (like high velocity or turbulence) but aren’t the standard indicator of a positive shift.

Color Doppler maps encode flow direction relative to the transducer, with positive Doppler shifts representing flow toward the transducer. The standard convention is that toward the transducer is shown in red, so red indicates a positive shift. Flow away from the transducer yields a negative shift and is usually shown as blue. Green or yellow can appear in some systems for other purposes (like high velocity or turbulence) but aren’t the standard indicator of a positive shift.