Formation Of An Xray Image

Question 1

What effects the degree of absorption of a given tissue to X-ray photons?

Answer 1

The atomic number of the tissue
The specific gravity of the tissue
The thickness of the tissue

Question 2

What colour does gas show on an X-ray?

Answer 2

Very dark

Question 3

What colour does fat show on an X-ray?

Answer 3

Dark grey

Question 4

What colour does soft tissue or fluid show on an X-ray?

Answer 4

Mid grey

Question 5

What colour does bone show on an X-ray?

Answer 5

Nearly White

Question 6

What colour does metal show on a X-ray?

Answer 6

White

Question 7

What does the Kilovoltage (kV) control?

Answer 7

The quality or penetrating power of the x-ray beam

Question 8

What requires a higher kV?

Answer 8

Tissues that are very thick or have a higher anatomical number of specific gravity

Question 9

What does the kV affect on the X-ray image?

Answer 9

The scale of contrast (number of grey shades)
Radiographic density (degree of blackening of the film)

Question 10

What causes ‘Flat film’?

Answer 10

too high kV, over-penetrating tissues causing a dark film with few different shades

Question 11

What causes ‘soot and whitewash’?

Answer 11

Too low kV under penetrating the tissues appearing white on a black or dark grey background