Flash artifact can be reduced on the display by increasing the ______.

Flash artifact can be reduced on the display by increasing the ______.

• A. Wall filter
• B. Color gain
• C. Pulse repetition frequency
• D. Line density

Answer: (A)

Flash artifact in color Doppler comes from tissue motion and noise near the vessel walls that create sudden, bright color signals. The way to reduce it is to raise the wall filter, which is a high-pass filter that suppresses low-frequency Doppler shifts produced by stationary or slowly moving tissue. By increasing the wall filter, these tissue-related signals are attenuated while true high-velocity blood flow signals stay detectable, so the conspicuous flash diminishes on the display. Just be aware that if you set the wall filter too high, you may miss or under-represent slow flow in small vessels or diastolic flow, so it’s a balance. Other adjustments don’t target this artifact: color gain amplifies all color signals (including noise), PRF deals with velocity-related aliasing rather than tissue motion, and line density affects spatial resolution rather than artifact suppression.

Flash artifact in color Doppler comes from tissue motion and noise near the vessel walls that create sudden, bright color signals. The way to reduce it is to raise the wall filter, which is a high-pass filter that suppresses low-frequency Doppler shifts produced by stationary or slowly moving tissue. By increasing the wall filter, these tissue-related signals are attenuated while true high-velocity blood flow signals stay detectable, so the conspicuous flash diminishes on the display. Just be aware that if you set the wall filter too high, you may miss or under-represent slow flow in small vessels or diastolic flow, so it’s a balance. Other adjustments don’t target this artifact: color gain amplifies all color signals (including noise), PRF deals with velocity-related aliasing rather than tissue motion, and line density affects spatial resolution rather than artifact suppression.