Ch. 26 Density/Image Receptor Exposure (Exp I)

Question 1

The density of the radiographic image in a film-based environment is the…

Answer 1

• Easiest prime technical factor to evaluate
• Result of black metallic silver deposited on a film
• Degree of overall blackening of the image

Question 2

The optical density range visible to the human eye is:

Answer 2

0.25 to 2.50

Question 3

The brightness of the image on a viewing monitor is:

Answer 3

A function of the monitor

Question 4

The principal controlling factor of radiographic image density is:

Answer 4

mAs

Question 5

Which statement is FALSE:

a. As mAs increases, exposure increases
b. As. mAs decreases, density increases
c. As mAs increases, density increases
d. As mAs decreases, exposure increases

Answer 5

d. As mAs decreases, exposure increases

Question 6

The minimum change necessary to cause a visible shift in density is _____ percent of mAs.

Answer 6

25-35

Question 7

Which generator produces the least amount of radiographic density per mAs?

a. Single phase, 2 pulse
b. Three phase, 6 pulse
c. Three phase, 12 pulse
d. High-frequency generator

Answer 7

A. Single phase, 2 pulse

Question 8

Which generator produces the greatest amount of radiographic density per mAs?

a. Single phase, 2 pulse
b. Three phase, 6 pulse
c. Three phase, 12 pulse
d. High-frequency generator

Answer 8

d. high-frequency generator

Question 9

Which rule is used as a guide to maintain the same density when kVp changes?

Answer 9

15% rule

Question 10

Which factor influences the number of photons reaching the IR?

Answer 10

mAs

Question 11

Which factor influences the average energy of photons reaching the IR?

Answer 11

kVp

Question 12

The 15% rule changes:

Answer 12

Density and contrast

Question 13

The relationship between exposure and SID is:

Answer 13

Inversely proportional to the square of the distance

Question 14

The density maintenance formula mathematically resembles the:

Answer 14

Inverse square law

Question 15

What conclusion can you reach regarding an image with an S# of 750 and good radiographic image density on the display monitor?

Answer 15

The image is likely to demonstrate noise or quantum mottle

Question 16

A severely underexposed film image will:

Answer 16

Be unable to visualize recorded detail

Question 17

In the event of making a single exposure that is critical to the exam success, most experienced technologists will:

Answer 17

• Overexpose the IR slightly

- Provide enough exposure to permit viewing with a bright light or adequate histogram analysis

Question 18

In the case of film radiography, the response to exposure is:

Answer 18

Logarithmic

Question 19

Image brightness on an image display monitor is controlled by:

Answer 19

Window level

Question 20

The effect of mAs upon IR exposure is:

Answer 20

Directly proportional

Question 21

Optimum IR exposure to an IR is:

Answer 21

1 mR plus or minus 33%

Question 22

As you analyze your image, you come to the conclusion that is must have more exposure. As a general rule, you should increase:

Answer 22

mAs by 2x

Question 23

A change in kVp, as an exposure factor, affects:

Answer 23

• The amount of scatter production
• Beam intensity
• Average beam energy

Question 24

The greatest factor in the production of scatter radiation is:

Answer 24

Patient thickness

Question 25

Radiographic room A is a three-phase, 6-pulse generator. Room B is a high frequency generator. When going between these two rooms to perform examinations, what exposure modification is necessary to produce comparable exposure density?

Answer 25

No change is required between the two systems

Question 26

Focal spot blooming occurs with:

Answer 26

High mAs

Question 27

Because of the “heel effect,” x-ray beam intensity:

Answer 27

Is greater under the cathode side of the tube

Question 28

The anode heel effect is more pronounced with:

Answer 28

A 10 degree target angle

Question 29

When changing your SID from 72” to 56”:

Answer 29

Decrease your mAs by 50%

Question 30

All of the following will increase radiographic film density EXCEPT:

a. Increased developer temperature
b. Increased dryer temperature
c. Increased immersion time in developer
d. Increased developer concentration

Answer 30

b. Increased dryer temperature