Bushong reading Ch 11 Flashcards Preview

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Flashcards in Bushong reading Ch 11 Deck (15):
1

Contrast arises from what areas?

Light, dark and shades of gray on the x-ray image

2

What are the two principal characteristics of any image?

Spatial resolution and contrast resolution

3

Collimation improves...

Image contrast and reduces patient dose

4

What does reduced image contrast result from?

Scatter radiation

5

Grids with high frequency show...

Less distinct lines on images

6

What is the single largest factor in poor image quality?

Scatter radiation

7

What is the principal function of a grid?

To improve image contrast

8

What is the simplest type of grid?

Parallel

9

What is grid cutoff?

The undesired absorption of primary x-rays by the grid

10

What is the main disadvantage of parallel and crossed grids?

Grid cutoff

11

What type of grid is fabricated so that grid strips are parallel to the primary x-ray path across the entire image receptor?

Focussed grid

12

High ratio grids have less positioning __________ than low ratio grids

Latitude

13

What will happen if a grid is installed incorrectly and moves in the same direction as the grid strips?

Grid lines will appear

14

Greater positioning latitude is possible with what type of ratio grids?

Low ratio grids

15

The use of a moving grid instead of a stationary grid requires how much more patient dose?

15%