P3 1.1 X-Rays

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  • Created by: 12dalel
  • Created on: 26-03-17 11:45
How are X-Rays used in hospitals?
1) To make images and CT scans 2) To destroy tumours near the body surface
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Describe X-Rays
1) part of the electromagnetic spectrum 2) has a short wave length 3) Is ionising
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What is meant by ionising?
It can cause atoms to lose electrons, If an X-Ray hits an atom orbiting a nucleus it can give the electron enough energy to become free from its atom
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Describe how X-Rays are used in medical imaging
1) the X-Ray machine produces X-Rays 2) X-Rays travel through soft tissue but are absorbed by metal and bones 3) Photographic film turns black when hit by X-Rays, this leaves a white area where bones have absorbed X-Rays
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Why aren't X-Rays suitable for pregnancy scans?
They are ionising so can cause mutations which can lead to abnormal growths and birth defects
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What does a CT scanner do?
Produces a 3D image of the body by an X-Ray machine rotating around it
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How are images from a CT scanner formed?
By using a CCD (charged coupled device) instead of photographic film, this allows the images to be stored digitally
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What precautions are taken when using X-Ray machines and CT scanners?
1) patients are only allowed a certain amount of scans a year 2) Radiographers must stand behind a safety screen 3) Hospital staff wear special badges that change colour if they have been exposed to a high dose of X-Rays
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Other cards in this set

Card 2

Front

Describe X-Rays

Back

1) part of the electromagnetic spectrum 2) has a short wave length 3) Is ionising

Card 3

Front

What is meant by ionising?

Back

Preview of the front of card 3

Card 4

Front

Describe how X-Rays are used in medical imaging

Back

Preview of the front of card 4

Card 5

Front

Why aren't X-Rays suitable for pregnancy scans?

Back

Preview of the front of card 5
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