Which statement about formation of the color Doppler image is true?

Which statement about formation of the color Doppler image is true?

• A. The color and B-mode images are generally derived from the same pulse
• B. The color image is superimposed on top of the existing B-mode image
• C. The color and B-mode images are generally formed using the same frequency sound wave
• D. The B-mode image is usually obtained at a lower frequency than the color image

Answer: (B)

Color Doppler imaging combines flow information with the grayscale anatomy by displaying velocity data as colors directly on top of the B-mode image. The ultrasound system estimates blood movement from Doppler shifts and then maps that velocity to colors, which are then overlaid onto the existing B-mode image. This overlay lets you see where blood is flowing while still clearly viewing the surrounding structures, without replacing the anatomical image. While both images come from the same acoustic window and the same transducer, the defining feature is that the color flow map is superimposed onto the B-mode display, providing simultaneous structural and flow information.

Color Doppler imaging combines flow information with the grayscale anatomy by displaying velocity data as colors directly on top of the B-mode image. The ultrasound system estimates blood movement from Doppler shifts and then maps that velocity to colors, which are then overlaid onto the existing B-mode image. This overlay lets you see where blood is flowing while still clearly viewing the surrounding structures, without replacing the anatomical image. While both images come from the same acoustic window and the same transducer, the defining feature is that the color flow map is superimposed onto the B-mode display, providing simultaneous structural and flow information.