Ultrasound is a non-invasive imaging modality based on transmitting ultra-high frequency sound waves into the body and then receiving the returning echoes. Because the ultrasound images are captured in real time, they are able to show blood flowing through the vessels.

Ultrasound imaging is an important tool for physicians to aid in the diagnosis and treatment of many different medical conditions. It can be used to diagnose diseases and conditions associated with pain, swelling and infection. It is valuable in diagnosing blood clots and narrowing of the arteries. Ultrasound is helpful in guiding needles for cyst aspirations and biopsies of the breast and thyroid gland. During the procedure cells are extracted from abnormal or questionable areas, and sent for further testing.