Physics 3

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  • Created by: kelz0209
  • Created on: 13-04-14 19:44
What are X-ray photographs typically used to diagnose?
Broken bones and dental problems.
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What type of radiation is used to take CT scans?
X-rays.
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What property of X-rays makes them a suitable cancer treatment?
They are ionising which means they can kill cells.
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How can parts of a patient's body not being scanned be protected during an X-ray procedure?
They can be shielded with lead.
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1.What is partial reflection? 2.Why is it important for ultrasound scanning?
1.It occurs when a wave meets a boundary between a media. Some of the wave travels into the new medium and is refracted,whilst some is reflected.1.Because it allows ultrasound beams to be reflected by different boundaries at different depths.
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Give two medical uses of ultrasound.
Pre-natal scanning/breaking down kidney stones/checking blow flow in organs/imaging soft tissue/diagnosing heart problems.
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Jamie hasan X-ray taken to see if he has broken his arm. Explain why X-rays are not very useful for looking at soft tissue injuries.
Because X-rays mostly pass straight through soft tissue, so the structure of soft tissues doesn't appear on X-ray images.
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X-ray images can be formed using a charged-coupled device (CCD). Explain how a CCD forms an image.
CCDs are made of grids divided into millions of identical pixels. When an X-ray hits a pixel it produces an electronic signal. This can be used by a computer to form a digital image.
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Suggest one reason why CCDs are increasingly being used in medical imaging.
CCDs can be used to produce high resolution images.
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Give two ways in which radiographers can minimise their exposure to X-rays.
Leave the room while the X-ray image is being taken/Wear a lead apron(if they need to remain in the room)/Stand behind a lead screen.
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Ultrasound is used to produce an image of a fetus in pre-natal scans. Give one advantage and one disadvantage of using ultrasound for pre-natal scans.
Advantage-Can image soft tissue/is safe for the fetus. Disadvantage-Produces a fuzzy image/not as clear as other imaging techniques/poor resolution.
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Explain why X-rays would not be used for prenatal scans.
X-rays are ionising so they could harm the developing fetus.
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CT scans are typically used to diagnose head injuries. Explain why CT scans are particularly suited to medical imaging of the head.
X-ray used in CT scans can pass through and image both soft and hard tissue. CT scans produce high resolution images, which are necessary when diagnosing head injuries.
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Explain why doctors should avoid peforming multiple CT scans on a patient.
CT scans use a high intensity X-ray beam. This means they expose the patient to lots of ionising radiation which could be dangerous to the patient's health.
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Other cards in this set

Card 2

Front

What type of radiation is used to take CT scans?

Back

X-rays.

Card 3

Front

What property of X-rays makes them a suitable cancer treatment?

Back

Preview of the front of card 3

Card 4

Front

How can parts of a patient's body not being scanned be protected during an X-ray procedure?

Back

Preview of the front of card 4

Card 5

Front

1.What is partial reflection? 2.Why is it important for ultrasound scanning?

Back

Preview of the front of card 5
View more cards

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