111-Density/Exposure & Contrast

Question 1

Increasing kvp does what to exposure and contrast

Answer 1

Increases exposure

Decreases contrast

Question 2

Increasing number of pulses in generators does what to exposure and contrast

Answer 2

Increase exposure

Decrease contrast

Question 3

Increasing mas does what to exposure and contrast

Answer 3

Increases exposure

Nothing to contrast

Question 4

Using a small focal spot size does what to exposure and contrast

Answer 4

Nothing to both

Question 5

Using a large focal spot size does what to exposure and contrast

Answer 5

Nothing to both

Question 6

What does the use of the anode heel effect have on exposure and contrast

Answer 6

Nothing to both

Question 7

Increasing sid does what to exposure and contrast

Answer 7

Decrease exposure

Nothing to contrast

Question 8

Decreasing sid does what to exposure and contrast

Answer 8

Increase exposure

Nothing to contrast

Question 9

Increasing oid does what to exposure and contrast

Answer 9

Decrease exposure

Increase contrast

Question 10

Decreasing oid does what to exposure and contrast

Answer 10

Nothing to exposure

Decrease contrast

Question 11

Increasing filtration does what to exposure and contrast

Answer 11

Decrease exposure

Decrease contrast

Question 12

Decreasing filtration does what to exposure and contrast

Answer 12

Increase exposure

Increase contrast

Question 13

Increasing collimation does what to exposure and contrast

Answer 13

Decrease exposure

Increase contrast

Question 14

Increasing amount of irradiated material does what to exposure and contrast

Answer 14

Decrease exposure

Decrease contrast

Question 15

Increasing differences between atomic number of tissues does what to exposure and contrast

Answer 15

Decrease exposure

Increase contrast

Question 16

Increasing density of tissue does what to exposure and contrast

Answer 16

Decrease exposure

Increase contrast

Question 17

Using radiolucent contrast does what to exposure and contrast

Answer 17

Increase exposure

Increase contrast

Question 18

Using radiopaque contrast does what to exposure and contrast

Answer 18

Decrease exposure

Increase contrast

Question 19

Additive pathology does what to exposure and contrast

Answer 19

Decrease exposure

Decrease contrast

Question 20

Destructive pathology does what to exposure and contrast

Answer 20

Increase exposure

Increase contrast

Question 21

Increasing grid ratio does what to exposure and contrast

Answer 21

Decrease exposure

Increase contrast

Question 22

What is the controlling factor of brightness

Answer 22

Window level

Question 23

If you increase filtration, what happens to scatter

Answer 23

Increases

Question 24

What technical factor causes blooming of the focal spot

Answer 24

Higher mas

Question 25

What is considered a low subject contrast area

Answer 25

Abdomen

Question 26

What is considered a high subject contrast area

Answer 26

Chest, extremities

Question 27

When doubling exposure, the EI will increase by

Answer 27

300

Question 28

Over and underexposed images do what to contrast

Answer 28

Decrease

Question 29

Use of compensating filters do what to contrast

Answer 29

Nothing

Question 30

Exposure errors of ___% can be adjusted by digital processing

Answer 30

+/- 50%

Question 31

A pixel depth of zero appears

Answer 31

White

Question 32

If you increase window level, what happens to brightness of the image

Answer 32

Gets darker

Question 33

If you increase window width, what happens to contrast

Answer 33

Decreases

Question 34

What is the unit of brightness

Answer 34

Candela

Question 35

A minimum of ___% change in___ is needed for a visible change in density

Answer 35

30, mas

Question 36

When is the anode heel effect most noticed

Answer 36

With short sid and large field size

Question 37

What is quantization

Answer 37

Assigning digital densities to each pixel

Question 38

What is automatic rescaling

Answer 38

Digital processing to fit actual histogram closer to reference

Question 39

Use of a compensating filter does what to density

Answer 39

Decrease density