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Kettering Review > Image Production > Flashcards

Image Production Flashcards

(62 cards)

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1
Q

Increased Mas does what to receptor exposure

A

Increase

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2
Q

Increase in MAs does what to spatial resolution

A

Nothing

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3
Q

What 4 things contribute to distortion

A

OID
SID
Pt size
Angle (tube/part/receptor)

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4
Q

Increased kvp does what to receptor exposure

A

Increase

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5
Q

How does increased SID effect receptor exposure and spatial resolution

A

Decrease exposure, increased resolution

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6
Q

Increased OID does what to spatial resolution

A

Decrease

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7
Q

How does increased FSS affect receptor exposure and spatial resolution

A

No effect on exposure, decrease in resolution

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8
Q

How does a grid effect exposure and resolution

A

Decrease exposure, no effect on resolution

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9
Q

How does increased filtration effect exposure and resolution

A

Decrease exposure and no effect on resolution

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10
Q

How does increased collimation effect exposure and resolution

A

Decrease exposure and no effect on resolution

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11
Q

How does increased motion effect exposure and resolution

A

No effect on exposure, decreased resolution

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12
Q

What does increased heel effect do to exposure and resolution

A

Decreased exposure, no effect on resolution

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13
Q

What does an increase in pt size have on exposure and resolution

A

Decrease exposure, decrease in resolution

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14
Q

How does an increase in pathology effect exposure and resolution

A

Decrease exposure and no effect on resolution

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15
Q

What does an increase in angle have on exposure and resolution

A

No effect on exposure, decrease resolution

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16
Q

How does an increase in pixel size effect exposure and resolution

A

No effect on exposure, decrease in resolution

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17
Q

Increased pixel pitch does what to exposure and resolution

A

No effect on exposure, decrease in resolution

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18
Q

Increased fill factor does what to exposure and resolution

A

Increased exposure, increased resolution

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19
Q

Increased sampling frequency does what to exposure and resolution

A

No effect on exposure, increase in resolution

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20
Q

Increased matrix size does what to exposure and resolution

A

No effect on exposure, increase resolution

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21
Q

Increased FOV does what to exposure and resolution

A

Nothing to exposure, decrease resolution

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22
Q

Increased MTF does what to exposure and resolution

A

Nothing to exposure, increased resolution

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23
Q

Increased DQE does what to exposure and resolution

A

Increase exposure, nothing to resolution

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24
Q

Photographic factors are what

A

Factors affecting the amount of exposure the IR gets

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25
Geometric factors are what
Factors affecting the degree of divergence of the beam and the info recorded on the receptor - resolution & distortion
26
Mas =
Dose & quantity
27
Does mas directly or indirectly effect receptor exposure
Directly - proportionally
28
The receptor exposure on a radiography is proportional only to the total energy imparted to the image receptor
Reciprocity Law principle
29
When will the Reciprocity Law fail
When exposure times are less than 10 ms or longer than 5 sec
30
Is distance indirectly or directly related to exposure
Indirectly
31
Inverse square law
I1/I2=D2 squared/D1 squared
32
What formula do you use if your asked to maintain constant exposure when distance changes
Direct square law
33
Direct square law
Mas1/Mas2 = SID1 squared/ SID2 squared
34
If distance doubles, what happens to intensity
Intensity quarters
35
If distance goes from 40 to 80 what needs to be done to mas to maintain it
Multiplied by 4
36
If distance goes from 40 to 72 what needs to be done to mas to maintain exposure
Multiply by 3
37
If distance goes from 40 to 56 what needs to be done to mas to maintain exposure
Multiply by 2
38
If distance goes from 40 to 96 what needs to be done to mas to maintain exposure
Multiply by 5
39
Does kvp directly or indirectly effect exposure
Directly
40
A 15% increase or decrease in kvp, keeping all other factors constant, will result in a doubling or halving of exposure
15% rule
41
If kvp is increased how does that effect the number of photons produced
It will increase photons produced - the faster the electrons hit the target, the more photons produced.
42
If kvp is increased, how does that affect contrast and scatter
Increased scatter causes a decrease in contrast
43
What does a grid do for the image
Cleans up scatter/fog, improves contrast
44
Grids are what
Beam attenuators
45
Grid Conversion factor of 1 equals what grid ratio
No grid
46
Grid Conversion factor of 2 equals what grid ratio
5:1
47
Grid Conversion factor of 3 equals what grid ratio
6:1
48
Grid Conversion factor of 4 equals what grid ratio
8:1
49
Grid Conversion factor of 5 equals what grid ratio
10:1 or 12:1
50
Grid Conversion factor of 6 equals what grid ratio
16:1
51
Does filtration effect exposure indirectly or directly
Indirectly
52
What is flat fielding
It equals the exposure across the IR
53
Increase in field size does what to contrast
Decrease contrast
54
Window width controls
Contrast
55
Window level controls what
Brightness
56
What is the primary controlling factor of subject contrast
KVP
57
What controls contrast
LUT (Look Up Table)
58
Area of sharpness
Umbra
59
Area of unsharpness surrounding the image
Penumbra
60
As OID increases, what happens to magnification
Increases
61
For every 1” increase of OID, what do you need to do to SID
Increase SID by 7” to compensate
62
Formula to calculate magnification
Image size/object size = SID/SOD

Kettering Review (2 decks)

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