Quick Review Flashcards

1
Q

What concept controls the film’s overall darkness?

A

Density

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2
Q

What measurement primarily controls density?

A

mAs (mA X s)

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3
Q

What effect does increased mA, s, and/or mAs have on density?

A

Increased density

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4
Q

What kind of patient will require more mAs and why: smaller or larger patient?

A

Larger patient due to increase in tissue thickness

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5
Q

What effect does an increase in distance (SID/FFD) have on density?

A

Decreased density (rule of 3)

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6
Q

What effect does increased kVp have on density?

A

Increased density (due to increased scatter which adds more gray to the film therefore increasing overall darkness)

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7
Q

Which kind of screen requires more mAs to make them fluoresce: 200 speed or 400 speed?

A

200 speed (smaller)

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8
Q

What is the purpose of a grid?

A

Clean up scatter

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9
Q

When using a grid, what measurement must be increased and why?

A

mAs because the grid takes away levels of scatter (grays) thus takes away some color which takes away darkness

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10
Q

Why do we not increase kVp when using a grid?

A

Increases scatter production (which is what we are trying to get rid of)

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11
Q

What effect does both too much developer and being in the developer for too long have on density?

A

Increased density

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12
Q

What is the purpose of filtration?

A

Even out radiographic density

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13
Q

When x-raying a part with two different thicknesses, a filter is used to cover what part?

A

Thin part

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14
Q

What is the term for the varying shades of gray on a radiograph?

A

Contrast

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15
Q

What measurement primarily controls contrast?

A

kVp

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16
Q

What are the functions of kVp?

A

1 power in the x-ray bundle
2 brings anatomy to the film
3 causes scatter

17
Q

Which scale is associated with low contrast and is a result of using high kVp: long or short scale?

A

Long

18
Q

Which scale is associated with high contrast and is a result of using low kVp: long or short scale?

A

Short

19
Q

Which presents as a very black and white film: short or long scale?

A

Short

20
Q

Which presents as a very dull, gray film: short or long scale?

A

Long

21
Q

What structure is used when tissue thickness is 11 cm or greater to prevent scatter?

A

Grid

22
Q

Altering what measurement is required when a grid is used to remove scatter?

A

mAs

23
Q

What kind of grid ratio causes more scatter: low or high?

A

High grid ratio

24
Q

What term is used to explain how well represented the anatomy is radiographically aka crispness of the film?

A

Detail

25
Q

At what distance do we see the best detail?

A

SID/FFD of 72”

26
Q

What is the issue with the tube being close to the object?

A

Magnification (less definition)

27
Q

What is the ideal OFD to prevent magnification and destruction of detail?

A

Have part as close to film as possible

28
Q

How does density affect detail?

A

Increased density = decreased detail (film will be too dark to see anatomy

29
Q

Which scale decreases detail: short or long scale?

A

Long scale (too gray to see anatomy)

30
Q

Would increased or decreased developer lead to decreased detail?

A

Increased developer (because it increases density and visibility)

31
Q

How can tube tilt affect detail?

A

Wrong tube tube results in loss of detail (or not using tube tilt when required)