when the pressure is created due to genetic waves in which direction does the rays moves ?
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Answers
Waves appear in many different forms. Seismic waves shake the ground during earthquakes. Light waves travel across the universe, allowing us to see distant stars. And every sound we hear is a wave. So what do all these different waves have in common?
A wave is a disturbance that moves energy from one place to another. Only energy — not matter — is transferred as a wave moves.
The substance that a wave moves through is called the medium. That medium moves back and forth repeatedly, returning to its original position. But the wave travels along the medium. It does not stay in one place.
Imagine holding one end of a piece of rope. If you shake it up and down, you create a wave, with the rope as your medium. When your hand moves up, you create a high point, or crest. As your hand moves down, you create a low point, or trough (TRAWF). The piece of rope touching your hand doesn’t move away from your hand. But the crests and troughs do move away from your hand as the wave travels along the rope.
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Answer:
A Doppler ultrasound is an imaging test that uses sound waves to show blood moving through blood vessels. A regular ultrasound also uses sound waves to create images of structures inside the body, but it can't show blood flow.
Doppler ultrasound works by measuring sound waves that are reflected from moving objects, such as red blood cells. This is known as the Doppler effect.
There are different types of Doppler ultrasound tests. They include:
Color Doppler. This type of Doppler uses a computer to change sound waves into different colors. These colors show the speed and direction of blood flow in real time.
Power Doppler, a newer type of color Doppler. It can provide more detail of blood flow than standard color Doppler. But it cannot show the direction of blood flow, which can be important in some cases.
Spectral Doppler. This test shows blood flow information on a graph, rather than color pictures. It can help show how much of a blood vessel is blocked.
Duplex Doppler. This test uses standard ultrasound to take images of blood vessels and organs. Then a computer turns the images into a graph, as in spectral Doppler.
Continuous wave Doppler. In this test, sound waves are sent and received continuously. It allows for more accurate measurement of blood that flows at faster speeds.
Other names: Doppler ultrasonography
What is it used for?
Doppler ultrasound tests are used to help health care providers find out if you have a condition that is reducing or blocking your blood flow. It may also be used to help diagnose certain heart diseases. The test is most often used to:
Check heart function. It is often done along with an electrocardiogram, a test that measures electrical signals in the heart.
Look for blockages in blood flow. Blocked blood flow in the legs can cause a condition called deep vein thrombosis (DVT).
Check for blood vessel damage and for defects in the structure of the heart.
Look for narrowing of blood vessels. Narrowed arteries in arms and legs can mean you have condition called peripheral arterial disease (PAD). Narrowing of arteries in the neck can mean you have a condition called carotid artery stenosis.
Monitor blood flow after surgery.
Check for normal blood flow in a pregnant woman and her unborn baby.
Why do I need a Doppler ultrasound?
You may need a Doppler ultrasound if you have symptoms of reduced blood flow or a heart disease. Symptoms vary depending on the condition causing the problem. Some common blood flow conditions and symptoms are below.
Symptoms of peripheral arterial disease (PAD) include:
Numbness or weakness in your legs
Painful cramping in your hips or leg muscles when walking or climbing stairs
Cold feeling in your lower leg or foot
Change in color and/or shiny skin on your leg