Color flash artifact is obscuring the anatomy of interest in an exam of the abdominal aorta. What can you do to reduce impact of the flash?

Color flash artifact is obscuring the anatomy of interest in an exam of the abdominal aorta. What can you do to reduce impact of the flash?

• A. Increase the color gain
• B. Decrease the pulse repetition frequency
• C. Increase the wall filter
• D. Increase the Doppler transmit frequency

Answer: (C)

Color flash comes from motion-related clutter near the area of interest. The wall filter acts as a high-pass filter for the Doppler signal, suppressing low-velocity Doppler shifts from tissue motion and wall movement while preserving the higher-velocity blood flow signals. By increasing the wall filter, you reduce the tissue clutter that colors the image, making the abdominal aorta anatomy clearer. Other options worsen or don’t address clutter: increasing color gain magnifies both true flow and noise; lowering the PRF can cause more aliasing and clutter; increasing the Doppler transmit frequency doesn’t target clutter and can affect penetration.

Color flash comes from motion-related clutter near the area of interest. The wall filter acts as a high-pass filter for the Doppler signal, suppressing low-velocity Doppler shifts from tissue motion and wall movement while preserving the higher-velocity blood flow signals. By increasing the wall filter, you reduce the tissue clutter that colors the image, making the abdominal aorta anatomy clearer. Other options worsen or don’t address clutter: increasing color gain magnifies both true flow and noise; lowering the PRF can cause more aliasing and clutter; increasing the Doppler transmit frequency doesn’t target clutter and can affect penetration.