Propagation speed error at the vessel wall interface is most likely to cause which phenomenon?

Propagation speed error at the vessel wall interface is most likely to cause which phenomenon?

• A. Mirror image artifact
• B. Propagation speed error at the vessel wall interface
• C. Shadowing
• D. Doppler aliasing

Answer: (B)

Propagation speed errors happen when the ultrasound system assumes a certain speed of sound to convert echo arrival time into depth, but the actual speed differs in the tissues. At a vessel wall interface, there’s a boundary between media with different speeds, so echoes from that boundary are placed at the wrong depth. This misplacement is the propagation speed error artifact, which is most likely to occur in that spot. Other artifacts come from different mechanisms: mirror image artifacts arise from strong reflectors creating a duplicate image, shadowing comes from strong attenuation, and Doppler aliasing stems from insufficient sampling frequency relative to blood velocity.

Propagation speed errors happen when the ultrasound system assumes a certain speed of sound to convert echo arrival time into depth, but the actual speed differs in the tissues. At a vessel wall interface, there’s a boundary between media with different speeds, so echoes from that boundary are placed at the wrong depth. This misplacement is the propagation speed error artifact, which is most likely to occur in that spot.

Other artifacts come from different mechanisms: mirror image artifacts arise from strong reflectors creating a duplicate image, shadowing comes from strong attenuation, and Doppler aliasing stems from insufficient sampling frequency relative to blood velocity.