Grids

Question 1

The amount of scatter __________ with larger field size, a larger patient, and increase kVp

Answer 1

Increases

Question 2

When should you use a grid?

Answer 2

When the body part is bigger than 10-12 cm, when you use a kVp higher that 60-70, when edema is presentand when fluid is present, or larger extremities

Question 3

1 inch = _____ cm

Answer 3

2.5

Question 4

How is the grid constructed?

Answer 4

Alternate strips of lead separated by a radiolucent substance (aluminum or plastic)

Question 5

Grid Strips are _______ and have _______ x-ray absorption properties.

Answer 5

Thin ; high

Question 6

Grid ratio

Answer 6

the height of the lead strips to the width of the interspace material between them (not thickness)
Strip height divided by interspace width

Question 7

Grid frequency

Answer 7

The number of grid lines per inch

Question 8

What is the purpose of a grid?

Answer 8

To remove scatter radiation and improve contrast