Topic 6 Ultrasound Flashcards

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1
Q

What is ultrasound

A

Sabbath frequencies higher than 20,000 Hz

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2
Q

What can electrical devices be made to produce

A

Electrical oscillations over a range of frequencies
Please can easily be converted into mechanical vibrations to produce sound waves be on the range of human hearing

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3
Q

What is partial reflection

A

When a wave passes from one medium to another some of the ray is reflected off a Boundry And some is transmitted and reflected

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4
Q

What happens to ultrasounds at boundaries

A

They get partially reflective

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5
Q

How can partially reflected raise be able to detect how far away are boundaries

A

You can point of course of ultrasound at an object and wherever there are boundaries between one substance and another some of the ultrasound gets reflected back
this can be measured to see how far away it is

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6
Q

How is ultrasound used in medical imaging for prenatal scanning of the fetus

A

Ultrasound can pass through the body whenever they reach a boundary between two different media like fluid in the womb and the skin of a fetus some of the weight is reflected back undetected
The exact timing distribution of these echoes are processed by a computer to produce a video image of a fetus

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7
Q

How old is unsafe for prenatal scanning

A

No one knows for sure but x-rays would definitely be more dangerous

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8
Q

How are ultrasounds used an industrial imaging e.g. finding flaws in materials

A

Ultrasound can also be used to find flaws in objects such as pipes material such as wood or metal
Ultrasound waves entering a material will usually be reflected by the far side of the material
If there is a floor such as a crack inside the object the wave will be reflected sooner

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9
Q

What is Eco sounding

A

Uses high frequency sound waves e.g. ultrasounds used by boats and submarines to find out the depth of water they are in or locate objects in deep water

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