What are some common uses of the procedure? The images can also show blood flowing through blood vessels. 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. TCD may be used alone or with other diagnostic exams such as magnetic resonance imaging (MRI), magnetic resonance angiography (MRA) and computed tomography (CT) scans. This type of ultrasound exam is also used during surgical procedures to monitor blood flow in the brain. Transcranial DopplerĪ transcranial Doppler (TCD) ultrasound evaluates both the direction and velocity of the blood flow in the major cerebral arteries of the brain. The ultrasound probe and some gel are placed on the outside of the head in one of those regions without bone. The gaps between those skull bones provide a "window," allowing the ultrasound beam to freely pass into and back from the brain. Since ultrasound waves do not pass through bone easily, this exam is most commonly performed on infants, whose skulls have not completely formed. Head UltrasoundĪ head ultrasound examination produces images of the brain and the cerebrospinal fluid that flows and is contained within its ventricles, the fluid filled cavities located in the deep portion of the brain. Head and transcranial Doppler are two types of cranial ultrasound exams used to evaluate brain tissue and the flow of blood to the brain, respectively.
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