A method of using high frequency sound waves to detect blood clots.
A radiological study used to see blood flowing through vessels; especially used immediately after liver transplant to make sure the blood is flowing to the new organ. The procedure is painless; however, some children need to be sedated.
Doppler ultrasound is used early in high-risk pregnancies to evaluate blood flow through the fetus's umbilical artery. Its ultrasonic waves shift in frequency, allowing it to measure velocity.
the Doppler phenomenon refers to the cange in wave length that occurs when a sound travels toward, or away from, the observer (think of the siren's pitch that changes when an ambulance drives past). The same occurs with ultrasounds, and a doppler allows one to measure the amount and direction of flow inside a blood vessel, by measuring the wave length reflected off the blood. In TTTS, "critical dopplers" refers to abnormal flow in the blood vessels or the heart: blood flow in the umbilical vein can be pulsatile, it can be absent in diastole in the umbilical artery; or blood can be seen to leak back through a heart valve ( tricuspid regurgitation).
A listening device by which your doctor can examine blood flow through the major veins and arteries and hear a fetal heartbeat by about the 12th week
A technology that uses sound waves to assess blood flow within the heart and blood vessels and to identify leaking valves.
Doppler ultrasound is used early in high-risk pregnancies to evaluate the blood flow through the foetus's umbilical artery
test usually combined with ECHO (see below). Doppler can produce a colour coded image of blood flow within the heart and detect areas of turbulent flow. The pattern of filling and contraction of the heart in Hypertrophic Cardiomyopathy can also be assessed.
a test in which very high frequency sound waves are bounced off the heart and blood vessels
Technique used to characterize blood flow in the heart or blood vessels in which ultrasound waves are reflected off blood cells as they move in the bloodstream; also, a listening device with which doctors can hear a fetal heartbeat by about the 12th week of gestation.
1. A technique used early in high-risk pregnancies to check the blood flow through the fetus's umbilical cord. 2. Pocket-sized handheld device which can be used to listen to the babies heartbeat during pregnancy.
A form of ultrasound that can detect and measure blood flow. Doppler ultrasound depends on the Doppler effect, a change in the frequency of a wave resulting here from the motion of a reflector, the red blood cell . See the entire definition of Doppler ultrasound
An easily performed, painless test that is often performed after liver transplantation and shows whether or not the blood flow to and from the liver is normal.
A noninvasive test using sound waves to evaluate blood flow in the heart or blood vessels.
Technique used to determine the blood flow in the heart or blood vessels in which ultrasound waves are reflected off blood cells as they move in the blood.
use of a Doppler probe during an ultrasound to look at blood flow.
ultrasound technique for measuring blood flow
An application of diagnostic ultrasound used to detect moving blood cells or other moving structures and measure their direction and speed of movement. The Doppler effect is used to evaluate movement by measuring changes in frequency of the echoes reflected from moving structures. In many instances, Doppler ultrasound has replaced x-ray methods such as angiography, as a method to evaluate blood vessels and blood flow. Doppler ultrasound permits real-time viewing of blood flow that cannot be obtained by other methods. Doppler ultrasound has proved a boon in all areas of ultrasound, aiding in the evaluation of the major arteries and veins of the body, the heart, and in obstetrics for fetal monitoring. Types of Doppler ultrasound include: Color Doppler Power Doppler Spectral Doppler
A procedure that uses sound waves to evaluate heart, blood vessels, and valves.
An ultrasound device, usually hand-held, that detects the fetus's heartbeat.