Final answer:
Ultrasound has reduced sensitivity in patients with large breasts and for detecting deep lesions. Breast density does not affect sensitivity on ultrasound like it does in mammography.
Step-by-step explanation:
Ultrasound has reduced sensitivity in patients with very large breasts (> 4 cm in thickness) and reduced sensitivity for detecting deep lesions (especially in large breasts). Breast density does not alter sensitivity on ultrasound like it does in mammography.
Ultrasound scans produce density information based on the intensity of reflected sound, which is related to changes in density. However, ultrasound is less effective in detecting abnormalities in patients with larger breasts or deep lesions.
For example, the breast size can affect the ability of ultrasound waves to penetrate through the tissue and accurately detect any abnormalities. Additionally, the breast density has a more significant impact on sensitivity in mammography compared to ultrasound.