The Human Body Through Images

Question 1

What are the 2 attributes of a wave?

Answer 1

Wavelength and frequency

Question 2

What is the relationship between wavelength and energy ?

Answer 2

Wavelength and energy are inversely proportional.

Longer wavelength = lower energy
Shorter wavelength = greater energy

Question 3

The high energy of gamma rays allow them to…?

Answer 3

Penetrate through solid matter and cause serious damage to macromolecules of life

Question 4

What is the relationship between wavelength and frequency?

Answer 4

They are inversely proportional.

Shorter wavelength = higher frequency
Longer wavelength = lower frequency

Question 5

How are X-rays produced?

Answer 5

Decelerating high velocity electrons

Question 6

In an X-ray tube, what is the source of electrons?

Answer 6

Cathode which is heated by a filament

Question 7

In an X-ray tube, what does the anode do?

Answer 7

Because it has a positive voltage, it attracts electrons so that they reach a high velocity.

Question 8

How are conventional x-ray images taken?

Answer 8

By passing rays through body and exposing a photographic film

Question 9

In x-ray imaging, what areas appear dark?

Answer 9

Those that were exposed by x-rays

Question 10

In x-ray images viewed with a fluorescent screen (fluoroscopy), how do the images look?

Answer 10

Exposed areas - bright

Unexposed areas - dark

Question 11

Is fluoroscopy safe?

Answer 11

No b/c it exposes patients to much higher doses of x-radiation = hazardous