leftgps.blogg.se - Doppler ultrasound

The gel allows sound waves to travel back and forth between the transducer and the area under examination. The technologist applies a small amount of gel to the area under examination and places the transducer there. The same principles apply to sonar used by boats and submarines. The transducer sends out inaudible, high-frequency sound waves into the body and listens for the returning echoes. Some exams may use different transducers (with different capabilities) during a single exam. The transducer is a small hand-held device that resembles a microphone. Ultrasound machines consist of a computer console, video monitor and an attached transducer.

detect abnormalities in the blood vessels, lymph nodes and lymphatic vessels.

predict a higher risk of stroke in children with sickle cell disease.

In children, Doppler ultrasound is used to:

increased blood flow, which may be a sign of infection.

reduced or absent blood flow to various organs, such as the testes or ovary.

tumors and congenital vascular malformations.

blockages to blood flow (such as clots).

verify the position of a metal stent placed to maintain carotid blood flow.ĭoppler ultrasound helps the doctor to see and evaluate:.

check the state of the carotid artery after surgery to restore normal blood flow.

locate a hematoma, a collection of clotted blood that may slow and eventually stop blood flow.

a family history of stroke or heart diseaseĪ carotid ultrasound is also performed to:.

Other risk factors calling for a carotid ultrasound are: In some cases, it is also performed in preparation for coronary artery bypass surgery. It may also be performed if a patient has high blood pressure or a carotid bruit (pronounced brU-E)-an abnormal sound in the neck that is heard with the stethoscope. If a significant narrowing is detected, a comprehensive treatment may be initiated.

The major goal of carotid ultrasound is to screen patients for blockage or narrowing of their carotid arteries, which if present may increase their risk of having a stroke. The carotid ultrasound is most frequently performed to detect narrowing, or stenosis, of the carotid artery, a condition that substantially increases the risk of stroke. What are some common uses of the procedure? It allows the doctor to see and evaluate blood flow through arteries and veins in the body. The images can also show blood flowing through blood vessels.Īn ultrasound of the body's two carotid arteries, which are located on each side of the neck and carry blood from the heart to the brain, provides detailed pictures of these blood vessels and information about the blood flowing through them.Ī Doppler ultrasound study is usually an integral part of a carotid ultrasound examination.ĭoppler ultrasound is a special ultrasound technique that evaluates movement of materials in the body. Because ultrasound captures images in real-time, it can show the structure and movement of the body's internal organs. Ultrasound exams do not use radiation ( x-rays). A computer uses those sound waves to create an image. The probe collects the sounds that bounce back. High-frequency sound waves travel from the probe through the gel into the body. It uses a small probe called a transducer and gel placed directly on the skin. Ultrasound imaging is also called sonography.

It produces pictures of the inside of the body using sound waves.

Ultrasound imaging is a noninvasive medical test that helps physicians diagnose and treat medical conditions.