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Check for varicose veins or other vein problems.

After a stroke, this can be done with a test called transcranial Doppler (TCD) ultrasound.

Assess blood flow after a stroke or other condition that might be caused by a problem with blood flow.

This is a condition caused by atherosclerosis of the lower limbs.

Check leg pain that may be caused by intermittent claudication.

It's most often used for the neck, arms, and legs.

Find blood clots and blocked or narrowed blood vessels in almost any part of the body.

Power Doppler is most often used to look at blood flow through vessels within solid organs. Power Doppler can get some images that are hard or impossible to get using standard color Doppler. Power Doppler is a special type of color Doppler. These colors show the speed and direction of blood flow through the vessel. A computer changes the Doppler sounds into colors that are overlaid on the image of the blood vessel. Color Doppler uses standard ultrasound methods to make a picture of a blood vessel.

This graph helps to show the speed and direction of blood flow through the blood vessel. A computer turns the Doppler sounds into a graph. This test uses standard ultrasound methods to make a picture of a blood vessel and the organs around it.

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It uses a portable machine that can quickly check the extent of blood vessel damage or disease. This type of ultrasound can be done at the bedside in the hospital.

The doctor listens to the sounds made by the transducer to assess the blood flow through an area that may be blocked or narrowed. This type uses the change in pitch of the sound waves to provide information about blood flow through a blood vessel. The three basic types of Doppler ultrasound are: "Bedside" or continuous wave Doppler. These graphs or pictures can be saved and reviewed later.

Information from the reflected sound waves can be used to make graphs or pictures that show the flow of blood through the blood vessels. If there is no blood flow, the pitch does not change. The movement of blood cells causes a change in the pitch of the reflected sound waves. The sound waves bounce off solid objects, including blood cells. It sends and receives sound waves that are amplified through a microphone.

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During pregnancy, Doppler ultrasound may be used to look at blood flow in an unborn baby to check the baby's health.ĭuring Doppler ultrasound, a handheld device is passed lightly over the skin above a blood vessel. This problem is called a pulmonary embolism. The test also can find blood clots in leg veins ( deep vein thrombosis, or DVT) that could break loose and block blood flow to the lungs. It can show blocked or reduced flow of blood through narrow areas in the major arteries of the neck. It helps doctors assess the blood flow through major arteries and veins, such as those of the arms, legs, and neck. All rights reserved.A Doppler ultrasound test uses reflected sound waves to see how blood flows through a blood vessel. While these data are collected, it seems prudent to continue to adhere to the principle of 'as low as reasonably achievable' (ALARA) when exposing first-trimester fetuses to Doppler ultrasound.Ĭopyright Â© 2012 Elsevier Ltd. It is suggested that there is a need for animal studies of developmental programming using exposure to Doppler ultrasound scanning as the exposure of interest, and for more observational data to be collected in the clinical setting.

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Excess free radical exposure early in gestation is a strong candidate for the final common pathway underlying developmental programming effects, and gives rise to concern that fetuses exposed to high levels of ultrasound are at risk of a developmental programming effect. These effects may be mediated via thermal or mechanical disruption to the developing conceptus, giving rise to free radical damage. We consider the idea that there may be long-term developmental implications for fetuses exposed to Doppler ultrasound early in gestation. Doppler ultrasound exposure in utero gives rise to increased apoptosis in animal models, and there is evidence of the effects of exposure to Doppler ultrasound persisting throughout life, with increased non-right-handedness observed in human epidemiological studies.

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However, exposure to high levels of Doppler ultrasound during early development is increasingly common, and the full safety implications of this exposure are not clear. There is no evidence of immediate or long-term harm to the developing fetus from exposure to B mode ultrasound. Ultrasound scanning has been used as a diagnostic and screening tool in obstetric practice for over 50 years.