What is the maximum recommended standoff pad thickness for breast ultrasound?

• A. 0.5 cm
• B. 1 cm
• C. 2 cm
• D. 3 cm

Answer: (B)

Standoff pads affect near-field imaging by adding a layer between the transducer and the breast tissue. That extra tissue-like layer can improve contact for superficial structures, but it also broadens the path the sound must travel and can introduce attenuation and reflections. If the pad is too thick, the ultrasound beam spends more time in the pad than in the breast, which degrades near-field resolution and can distort depth measurements or obscure very superficial lesions. For breast ultrasound, keeping the pad at about 1 cm or less preserves image quality while still helping with contact; thicker pads (around 2 cm or 3 cm) would significantly degrade the near-field image and are not recommended.