X-Rays And Ultrasound Flashcards

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1
Q

What feature allows X-rays to penetrate healthy tissue but be absorbed by bone?

A

Short Wavelength

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2
Q

How do CT scans work?

A

Multiple X-Rays build up a 3d image of the patient

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3
Q

What is a medical use of X-Rays (Not imaging)

A

Ionising radiation can be used to treat cancer (Radiotherapy)

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4
Q

Name two precautions radiographers use to protect themselves from the ionising radiation of X-rays

A

Standing behind a lead screen, leaving the room whilst the x-ray is occurring

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5
Q

Give a short definition of ultrasound:

A

Sound waves above the human range of hearing (20,000 Hz)

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6
Q

When ultrasound reaches a boundary between media, what happens to the wave?

A

Some is refracted, and some is partially reflected back.

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7
Q

How is ultrasound used in industry?

A

To detect cracks in floors

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8
Q

How is ultrasound used medically (other than in medical imaging)

A

To break down kidney stones

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9
Q

Why can a baby not be x-rayed?

A

The dose of radiation could cause cancer to develop in the unborn babies cells

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10
Q

An oscilloscope trace shows that the time between the reflected pulses is 0.00001 seconds. The ultrasound travels at 100m/s. Calculate the distance between the two boundaries.
S=VxT (Distance=SpeedxTime)

A

1500x0. 00001=0.015m
0. 015/2= 0.0075m
7. 5mm.

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