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Radiography > 111-Density/Exposure & Contrast > Flashcards

111-Density/Exposure & Contrast Flashcards

1
Q

Increasing kvp does what to exposure and contrast

A

Increases exposure

Decreases contrast

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2
Q

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

A

Increase exposure

Decrease contrast

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3
Q

Increasing mas does what to exposure and contrast

A

Increases exposure

Nothing to contrast

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4
Q

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

A

Nothing to both

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5
Q

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

A

Nothing to both

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6
Q

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

A

Nothing to both

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7
Q

Increasing sid does what to exposure and contrast

A

Decrease exposure

Nothing to contrast

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8
Q

Decreasing sid does what to exposure and contrast

A

Increase exposure

Nothing to contrast

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9
Q

Increasing oid does what to exposure and contrast

A

Decrease exposure

Increase contrast

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10
Q

Decreasing oid does what to exposure and contrast

A

Nothing to exposure

Decrease contrast

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11
Q

Increasing filtration does what to exposure and contrast

A

Decrease exposure

Decrease contrast

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12
Q

Decreasing filtration does what to exposure and contrast

A

Increase exposure

Increase contrast

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13
Q

Increasing collimation does what to exposure and contrast

A

Decrease exposure

Increase contrast

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14
Q

Increasing amount of irradiated material does what to exposure and contrast

A

Decrease exposure

Decrease contrast

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15
Q

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

A

Decrease exposure

Increase contrast

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16
Q

Increasing density of tissue does what to exposure and contrast

A

Decrease exposure

Increase contrast

17
Q

Using radiolucent contrast does what to exposure and contrast

A

Increase exposure

Increase contrast

18
Q

Using radiopaque contrast does what to exposure and contrast

A

Decrease exposure

Increase contrast

19
Q

Additive pathology does what to exposure and contrast

A

Decrease exposure

Decrease contrast

20
Q

Destructive pathology does what to exposure and contrast

A

Increase exposure

Increase contrast

21
Q

Increasing grid ratio does what to exposure and contrast

A

Decrease exposure

Increase contrast

22
Q

What is the controlling factor of brightness

A

Window level

23
Q

If you increase filtration, what happens to scatter

A

Increases

24
Q

What technical factor causes blooming of the focal spot

A

Higher mas

25
Q

What is considered a low subject contrast area

A

Abdomen

26
Q

What is considered a high subject contrast area

A

Chest, extremities

27
Q

When doubling exposure, the EI will increase by

A

300

28
Q

Over and underexposed images do what to contrast

A

Decrease

29
Q

Use of compensating filters do what to contrast

A

Nothing

30
Q

Exposure errors of ___% can be adjusted by digital processing

A

+/- 50%

31
Q

A pixel depth of zero appears

A

White

32
Q

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

A

Gets darker

33
Q

If you increase window width, what happens to contrast

A

Decreases

34
Q

What is the unit of brightness

A

Candela

35
Q

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

A

30, mas

36
Q

When is the anode heel effect most noticed

A

With short sid and large field size

37
Q

What is quantization

A

Assigning digital densities to each pixel

38
Q

What is automatic rescaling

A

Digital processing to fit actual histogram closer to reference

39
Q

Use of a compensating filter does what to density

A

Decrease density

Radiography (11 decks)

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