Which artefact is caused by reverberation in ultrasound imaging?

• A. Acoustic shadowing
• B. Multipath artefacts
• C. Comet tail artefact
• D. Mirror image artefact

Answer: (D)

The mirror image artefact occurs due to the phenomenon of reverberation, which happens when ultrasound waves bounce back and forth between two reflective surfaces before returning to the transducer. This delay in the returning echoes causes the reflected image to appear duplicated, creating a mirror-like effect of the original structure. The artefact typically manifests in areas where there are strong reflectors and can distort the true anatomical representation by displaying additional, often false images.

Understanding the basis of reverberation is key in ultrasound imaging, as it highlights how sound waves interact with varying tissues and surfaces. In the case of the mirror image artefact, recognizing its origin aids sonographers in distinguishing true anatomical features from artefacts, enabling more accurate diagnosis and assessment.