Physics Unit 3.3 Medical Applications of Physics - X-rays, CT scans, and Ultrasounds

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Whar are x-rays?
Part of the electromagnetic spectrum, and are transverse waves. The have high frequencies, and short wavelengths. They affect a photographic film in the same way as light
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How can x-rays increases risk of cancer?
High energy causes ionisation which causes mutation of cells.
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What are x-rays absorbed by?
Bone, metal, teeth etc.
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What are x-rays transmitted by?
Soft tissues e.g. muscle.
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Roughly, what is the wavelength of a x-ray?
The diameter of an atom.
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What can we use x-rays for?
Bone fractures, and dental problems.
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Describe the quality of a CT scan.
High resolution, and provides 3D images of the whole body.
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How are electromagnetic images produced using a CD scanner?
They use charge-coupled devices (CCPs).
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What precautions must be taken by radiographers?
Wear a lead apron to pretect vital organs, and stand behind a screen.
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Describe ultrasounds.
Electronic systems can be used to produce ultrasound waves, which have a frequency higher than the upper limit of hearing for humans (20000Hz).
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What is the human hearing range?
20-20000Hz.
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What does an ultrasound partially reflect off?
The boundary between two different densities.
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Describe the uses of ultrasounds.
Pre-natal scanning, and removal of kidney stones.
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If asked to find the depth of the sea, what MUST you do?
You must halve the distance the pulse travelled.
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Other cards in this set

Card 2

Front

How can x-rays increases risk of cancer?

Back

High energy causes ionisation which causes mutation of cells.

Card 3

Front

What are x-rays absorbed by?

Back

Preview of the front of card 3

Card 4

Front

What are x-rays transmitted by?

Back

Preview of the front of card 4

Card 5

Front

Roughly, what is the wavelength of a x-ray?

Back

Preview of the front of card 5
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