Which artifact is associated with resonance of a gas bubble?

Which artifact is associated with resonance of a gas bubble?

• A. Grating lobes
• B. Comet tail
• C. Acoustic speckle
• D. Ring-down

Answer: (D)

Gas bubbles resonating under ultrasound emit energy at the transmitted frequency, producing a sustained echo behind the bubble known as ring-down. This artifact appears as a bright, continuous or decaying line extending from a strong reflector and is directly tied to bubble vibration, especially with gas pockets or microbubble contrast agents. Other artifacts come from different mechanisms: grating lobes stem from array physics, comet-tail comes from reverberation near strong reflectors, and acoustic speckle is the grainy pattern from tissue scatterers. The ring-down is the one specifically linked to bubble resonance.

Gas bubbles resonating under ultrasound emit energy at the transmitted frequency, producing a sustained echo behind the bubble known as ring-down. This artifact appears as a bright, continuous or decaying line extending from a strong reflector and is directly tied to bubble vibration, especially with gas pockets or microbubble contrast agents. Other artifacts come from different mechanisms: grating lobes stem from array physics, comet-tail comes from reverberation near strong reflectors, and acoustic speckle is the grainy pattern from tissue scatterers. The ring-down is the one specifically linked to bubble resonance.