Chapter 18 Key Terms

Question 1

Criss-cross grid

Answer 1

two linear grids placed on top of one another so that the lead strips form a criss-cross pattern

Question 2

Cross-hatched grid

Answer 2

two linear grids placed on top of one another so that the lead strips form a criss-cross pattern

Question 3

Focused grid

Answer 3

a grid created with the central grid strips parallel with the strips and becoming more inclined as they move away from the central axis; the lines would intersect along a point in space called the line of convergence

Question 4

Grid

Answer 4

a device used to improve contrast of the radiographic image

Question 5

Grid cutoff

Answer 5

the result of the primary beam being angled into the lead strips

Question 6

Grid frequency

Answer 6

the number of grid lines per inch or centimeter

Question 7

Grid ratio

Answer 7

the ratio of the height of the lead strips to the distance between the strips

Question 8

Linear grid

Answer 8

a grid with lead strips running in only one direction

Question 9

Parallel grid

Answer 9

a grid created with the lead and interspace strips running parallel to one another; the lines will never intersect