Grids

Question 1

Grid function

Answer 1

Improve image clarity by absorbing scatter radiation

Question 2

Grids are imbedded in the table between the subject and the film… how do they work

Answer 2

Lead strips absorb unwanted x rays
Radiolucent spacers admit wanted x rays

Question 3

What are grids made of

Answer 3

lead strips with radiolucent spacers

Question 4

Grids absorb some good photons that we would like to pass through to the film. How do we compensate

Answer 4

Increased mAs to increase photons

Question 5

Its important to increase mAs when using a grid to keep your film…..

Answer 5

Dense

Question 6

What is the grid ratio?

Answer 6

Height of the lead strips to the width of the spacer

Question 7

A high efficiency grid absorbs more ________ AND ___________ __________ making it necessary to increase mAs

Answer 7

Scatter
“Good” photons

Question 8

What are the 4 types of grids?

Answer 8

1. Parallel
2. Focused
3. Linear
4. Crossed

Question 9

How are the lead strips positioned in a parallel grid?

Answer 9

Parallel to each other and perpendicular to the film.

Question 10

When using a parallel grid, the beam diverges. The further you get from the center of the beam, the image is less clear. This is called _____________________.

Answer 10

Grid Cut Off