• Breast ultrasound is a non-invasive tool used to evaluate specific, often palpable areas of concern – such as a breast lump felt by a patient or physician and an area of concern seen on a mammogram. Breast ultrasound does not replace the need for mammography. Mammogram images are still needed to evaluate the entire breast. An ultrasound examination produces images of your breast using inaudible sound waves in a frequency range far above the range of human hearing.