Ultrasound or sonography involves the sending of sound waves through the
body. Those sound waves are reflected off the internal organs. The
reflections are then interpreted by special instruments that subsequently
create an image of anatomic parts.

An ultrasound image is a useful way of evaluating the body's circulatory system. Ultrasound images are captured in real-time, so they can help
physicians monitor the blood flow to organs and tissues throughout the body,
as well as evaluate the placement and success of repair, such as after
arterial bypass surgery. With ultrasound images, blockages can be identified
(ie: abnormalities like blood clots, plaque, emboli) and help plan for their
effective treatment.

What are some common uses of the procedure?

Ultrasound of the veins may reveal blood clots that require treatment, such
as anticoaglulant therapy (blood thinner), or filters to prevent clots from
traveling to the lungs (embolism).

Ultrasound of the vacular system also provides a fast, noninvasive means of
identifying blockages of blood flow in the neck arteries to the brain that
might produce a stroke or mini-stroke.

How should I prepare for the procedure?

You should wear comfortable, loose-fitting clothing for your ultrasound
exam. No other preparation is required.

The patient is positioned on an examination table that can tilt and move.

A clear gel is applied to the area that will be examined. The gel helps the
transducer make a secure contact and eliminates air pockets between the
transducer and the skin, since the sound waves cannot penetrate air. The
vascular technologist then presses the transducer firmly against the skin
and sweeps along the area of interest, reviewing the images on the monitor
and capturing "snapshots" as required. For venous ultrasound examinations,
the transducer is pressed gently on the leg.