Principles of Exposure

Question 1

If the mAs is increased, what happens to the IR exposure?

Answer 1

Increased

Question 2

Does mAs have an effect on contrast, spatial resolution, or distortion?

Answer 2

No

Question 3

If kVp is increased, what effect will it have on IR exposure and contrast?

Answer 3

Increased IR exposure, decreased contrast

Question 4

If the SID is increased, what effect will it have on exposure and geometric factors?

Answer 4

Decreased IR exposure, Increased spatial resolution, decreased distortion

Question 5

If the OID is decreased, what effect does it have on contrast, spatial resolution, and distortion?

Answer 5

Increased contrast, decreased spatial resolution, increased distortion

Question 6

If the focal spot size is increased, what effect does it have on spatial resolution?

Answer 6

Decreased spatial resolution

Question 7

If the tube filtration is increased, what effect does it have on IR exposure and contrast?

Answer 7

Decreased IR exposure, increased contrast

Question 8

If the collimation is increased, what effect does it have on IR exposure and contrast?

Answer 8

Increased IR exposure, decreased contrast

Question 9

If there is excess motion from the patient during a radiographic procedure, what would be the result?

Answer 9

Decreased spatial resolution

Question 10

If patient factors (size, pathology) are increased, what would be the effect on exposure and geometric factors?

Answer 10

Decreased IR exposure, Increased contrast, Decreased spatial resolution, Increased distortion

Question 11

What effect does the angle of the tube, part, or receptor have on spatial resolution and distortion?

Answer 11

Decreased spatial resolution, increased distortion

Question 12

Which technical factors can affect IR exposure?

Answer 12

Grids, kVp, mAs, SID

Question 13

When SID is increased, which change must be made to maintain IR exposure?

Answer 13

Increase mAs

Question 14

How is gross exposure error demonstrated in a digital image?

Answer 14

Missing data points

Question 15

The smallest exposure difference that can be detected and displayed by the imaging system is called

Answer 15

Contrast resolution

Question 16

Increasing the FOV will have what effect on pixel size?

Answer 16

Increased pixel size

Question 17

Scatter radiation does not affect

Answer 17

Recorded spatial resolution

Question 18

What kind of effect is it when an incoming X-ray photon interacts with an outer orbital electron of an atom

Answer 18

Compton effect

Question 19

As the kVp is increased, which interaction is also increased

Answer 19

Compton

Question 20

In a photoelectric interaction, the incoming photon from the primary beam collides with an

Answer 20

Inner orbital electron

Question 21

As kVp is increased, photoelectric effect is

Answer 21

Decreased

Question 22

What effects on an image does scatter radiation have

Answer 22

It creates fog that reduces both contrast and spatial resolution

Question 23

Why does higher kVp result in more scatter radiation fog

Answer 23

The high energy radiation is better able to escape the subject without being reabsorbed and more likely to cause fog on the radiograph

Question 24

What is the principle method for reducing scatter radiation fog

Answer 24

Using a grid

Question 25

High kVp produced what type of contrast

Answer 25

Low contrast

Question 26

High contrast is also called

Answer 26

Short scale contrast