Duplex ultrasound scanning
What is a duplex ultrasound scan?
VASCULAR SURGERY – EURODOCTOR.RU – 2007
Duplex ultrasound scanning is a combination of Doppler sonography with conventional ultrasound, which allows the doctor to see the structure of blood vessels. duplex scanning shows the movement of blood through the vessels and to measure the speed of blood flow. This method also allows you to determine the diameter of blood vessels and reveal their obstruction.
In traditional ultrasound used ultrasound waves, inaudible to the human ear, which are reflected by blood vessels. the computer then converts them into two-dimensional black-and-white image.
Doppler ultrasound to determine the speed at which sound waves are reflected from the moving effects. Ultrasonic beam hits the red blood cells and blood is reflected, and the speed of ultrasound depends on the speed of red blood cells. On the basis of the Doppler study of two-dimensional image is formed, which indicates whether there is obstruction to blood flow in a narrowing of blood vessels atheromatous plaques.
With duplex scanning of the doctor uses two types of ultrasound together. Traditional ultrasound shows the structure of blood vessels, and Doppler blood flow study shows for them. Duplex scanning provides an image that can be colored to indicate violations of medical blood flow, as well as its speed and direction. Duplex scanning is used in diagnosing the following diseases:
Duplex ultrasound scans carried out a doctor specialized in the past this method of research. Duplex scanning lasts 30 minutes.
Preparing for duplex scanning
If the conduct of duplex scanning is not connected with the research vessels of the abdomen (the aorta), then special training is required. In case if you want to conduct a study of the aorta is necessary to prepare the intestine – an enema. This is due to the fact that ultrasound can not pass through the intestinal gases.
The procedure duplex scanning
Before duplex scanning the patient lies down on the couch with his head slightly raised. Next, the doctor lubricates the sensor unit with gel to his movements on the patient's skin was light and smooth. The physician conducting the study, the patient's skin sensor shifting forward – backward. This method may cause some discomfort, but most people tolerate it well. On the screen unit duplex ultrasound scanning displays information received from the ultrasound transducer. Sometimes during the procedure, you can hear a special sound that characterizes the state of blood flow through the vessels.
No complications or side effects of duplex scanning does not.
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