Ultrasound

An ultrasound exam works by sending sound waves into the body through a handheld device called a transducer. The waves bounce off internal tissues and organs at different rates depending on their density, and a computer translates those echoes into a real-time image on a screen. Because it uses sound rather than radiation, ultrasound is safe for repeated use and during pregnancy.

In breast health, ultrasound is often used alongside mammography to take a closer look at an area of concern, or to distinguish between a solid mass and a fluid-filled cyst. Women with dense breast tissue or younger women whose breast tissue is inherently dense may find ultrasound a particularly useful complementary tool. It is also used to guide needle biopsies, helping the radiologist target the correct area with precision.

Beyond the breast, ultrasound is used to examine the thyroid, ovaries, uterus, kidneys, liver, and major blood vessels. Doppler ultrasound — a variation of the technique — can also show blood flow direction and speed, which is valuable in evaluating vascular conditions. The procedure is painless, requires no radiation, and typically takes 20 to 45 minutes depending on the area being examined.

Ultrasound is one of the most versatile imaging tools in medicine — widely available, radiation-free, and capable of providing real-time information about soft tissue, fluid, and blood flow. In breast care specifically, it plays an important role in clarifying findings from mammograms and guiding procedures like biopsies.

If you have dense breast tissue or if a mammogram has found something that needs a closer look, understanding how ultrasound works can help demystify what your provider is recommending. It is a complementary tool that adds information, not a replacement for other forms of screening.