What is a potential negative consequence of using a high wall filter?

What is a potential negative consequence of using a high wall filter?
A . Desired signal may be eliminated
B . Aliasing could occur
C . Penetration is reduced
D . Too much noise may appear on the image

View Answer

Answer: A

Explanation:

A high wall filter is used in Doppler ultrasound to eliminate low-frequency signals that may be attributed to vessel wall motion or other low-velocity flows. However, if the wall filter is set too high, it can inadvertently eliminate desired low-frequency Doppler signals that represent real blood flow, particularly in smaller vessels or those with slower flow velocities. This results in a loss of valuable diagnostic information.

Reference: ARDMS Sonography Principles and Instrumentation (SPI) Review, Doppler Ultrasound section.