What is an artifact that results in falsely bright areas behind fluid-filled structures on ultrasound?

• A. Acoustic shadowing
• B. Acoustic enhancement
• C. Reverberation
• D. Edge shadowing

Answer: (B)

The phenomenon being described — falsely bright areas behind fluid-filled structures on ultrasound — is known as acoustic enhancement. This artifact occurs when sound waves pass through a fluid medium, such as urine in the bladder or bile in the gallbladder, and are less attenuated compared to surrounding tissues. As a result, the reflected echoes from the fluid-filled area are increased, producing a brighter appearance on the ultrasound image beyond the fluid-filled structure. This can often be seen behind cysts or gallbladder, where normal tissues attenuate the sound more than fluid does.

Understanding the context helps clarify why this artifact is significant in ultrasound imaging. Recognizing acoustic enhancement is essential for sonographers to avoid misinterpretation of ultrasound findings, such as confusing normal structures with pathological ones based on appearance alone. This knowledge aids in making accurate diagnoses and effective patient care decisions.