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Radiography 1 (Purple) > Chapter 4 Rad 2 > Flashcards

Chapter 4 Rad 2 Flashcards

1
Q

KVP controls (3)

A

Energy, Penetration, Quality

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2
Q

MAS controls (3)

A

Quantity, Amount, Number of Electrons

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3
Q

Inorganic Grid Interspacer

A

Aluminum

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4
Q

Organic Grid Interspacer

A

Cardboard, Balsa Wood

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5
Q

Adult skull is age ___ & up?

A

6 years old ( 75kvp)

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6
Q

Name 2 destructive illnesses that would make you decrease technique

A

COPD, Pneumothorax

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7
Q

Name 2 Additive illnesses that would have you increase technique

A

Pneumonia, Pleural Effusion, Atelectasis

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8
Q

Formula for Grid Ratio

A

Heigh of PB strips/ Distance between Pb Strips

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9
Q

Do grids decrease the production of scatter?

A

No

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10
Q

Scatter is _____

A

density

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11
Q

When dealing with grids ___ on the Left ___ on the right

A

divide on the left, Multiply on the Right

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12
Q

Ratio 5:1 has what conversion factor?

A

2

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13
Q

Ratio 6:1 has what conversion factor?

A

3

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14
Q

Ratio 8:1 has what conversion factor?

A

4

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15
Q

Ratio 12:1 has what conversion factor?

A

5

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16
Q

Ratio 16:1 has what conversion factor?

A

6

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17
Q

Every time you double the speed you must ____ the mas in ___

A

cut, half

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18
Q

Every time you cut the speed in half you must ___ the ___

A

Double, Mas

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19
Q

Increased Screen Speed =

A

Decreased Patient Dose and Decreased Detail

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20
Q

Decreased Screen Speed =

A

Increased Patient Dose and Increased Detail

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21
Q

Inverse Square Law Formula

A

old mAs/ New mAs = old distance squared/ new distance squared

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22
Q

If you double the distance from the source or double the SID the exposure will be?

A

One fourth as strong

23
Q

If you cut the distance from the source in half or cut the SID in half the exposure will be?

A

Four times as strong

24
Q

Above 90 kVp = if kV increases by 15

A

cut mas in half

25
Q

Above 90 kVp = if kV decreases by 15

A

double mas

26
Q

Below 90 kVp= if kV increases by 10

A

cut mas in half

27
Q

Below 90 kVp= if kV decreases by 10

A

double mas

28
Q

In order to see a visible change in density you must increase or decrease the mAs by?

A

30%

29
Q

as mas is _______ the quantity of radiation is increased and density increases.

A

increased

30
Q

Milliamperage and Exposure Time are ______ related when maintaing the same mAs.

A

inversely

31
Q

the minimum change needed to correct for a density error is determined by multiplying or dividing by?

A

2

32
Q

high contrast = ____ scale, ____ kv

A

short scale, low KV

33
Q

Low contrast = ____ scale, ____kv

A

long scale, high kv

34
Q

____ influences density, ____ controls density

A

kVp, mAs

35
Q

Geometric factors of detail (3)

A

OID, SID, FS

36
Q

What controls contrast?

A

KV

37
Q

High kV creates more densities but with fewer difference low contrast _____ scale

A

long

38
Q

Low kV creates fewer densities but with greater differences high contrast _____ scale

A

short

39
Q

Increased scatter = ______ contrast

A

decrease

40
Q

Decreased scatter = ______ contrast

A

increased

41
Q

FS size affects ______

A

recorded detail/ spatial resolution

42
Q

Penumbra

A

Unsharpness

43
Q

Umbra

A

Recorded Detail

44
Q

Magnification =

A

size distortion

45
Q

True=

A

Shape Distortion

46
Q

For every 1’’ OID you must increase SID by ____ to compensate

A

8’’

47
Q

Where is scatter produced?

A

In the patient

48
Q

What is the 1st step in protection?

A

Collimation

49
Q

Generators with more efficient output ( like a 3 phase ) require ___ technique settings?

A

LOWER

50
Q

If the tube operates at 70kvp or higher must have ___ of filtration?

A

2.5mm/al

51
Q

main purpose of tube filtration is to

A

decrease patients skin dose

52
Q

Increased collimation = ______ scatter and density

A

decreased

53
Q

Positive Contrasts

A

BArium, Iodine

54
Q

Negative Contrast

A

Air CO 2

Radiography 1 (Purple) (5 decks)

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