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RAD 122 > Test 1 > Flashcards

Test 1 Flashcards

1
Q

What happens to detail when crystal ️size is decreases

A

Detail increases

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2
Q

What happens to detail when crystal ️size is increased

A

Detail decreases

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3
Q

Decreased screen speed will ________ density

A

Decrease

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4
Q

A cassette with 2 screens will _______ density

A

Increase

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5
Q

Thicker film emulsion will _______ detail

A

Decrease

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6
Q

Increasing mA with AEC will ______ density

A

Have no effect

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7
Q

Placing the detector over soft tissue instead of bone will _______ time

A

Decrease

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8
Q

Which of the following describes short scale contrast

A

High contrast
Low kVp
Black and white

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9
Q

What produces a longer scale of contrast

A

Increasing kVp

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10
Q

Decreasing kVP will _______ ️️speed

A

Decrease

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11
Q

Increasing phosphor ️size will ______ density

A

Increase

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12
Q

Decreasing screen phosphor ️size will _______ detail

A

Increase

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13
Q

Increasing the number of phosphor crystals in a screen will ________ ️️speed

A

Increase

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14
Q

When light exposes a film, density will ______

A

Increase due to fog

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15
Q

If no xray photons or light exposes a film the density will be

A

Decreased

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16
Q

Quantum Mottle is usually associated with _______ quantity of photons

A

Too few

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17
Q

Correcting quantum Mottle the tech must _______ the technique

A

Increase

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18
Q

Wider film latitude

A

Exhibits longer scale contrast

More forgiving film

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19
Q

Increase in kVp

A

Decreased contrast

Longer gray scale

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20
Q

Purpose of a grid

A

Clean up scatter

Increase contrast

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21
Q

Increased lead content

A

Increase pt dose

Increase contrast

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22
Q

Increase grid ratio

A

Increase dose

Increase contrast

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23
Q

More than one detector activated will result in what when using AEC

A

Averaging of the signal

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24
Q

What happens to density when screen speed increases

A

Density increases

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25
Screen ️️speed formula
mAs1 RS2 ----- = ------ mAs2. RS1
26
Grid conversion
``` 0 ➡️ 1x 5:1➡️ 2x 6:1➡️ 3x 8:1➡️4x 12:1➡️5x 16:1➡️6x Formula mAs1 x GCF 2 ------------------ GCF1 ```
27
Grid errors
Off level ➡️decrease density Off center ➡️ ️decrease density Off focus ➡️ ️decrease density at lateral edges Upside down focus grid ➡️ picture is center only Moire effect ➡️ creates dark lines across
28
mA in an AEC is changed from 100 to 30 the time of exposure would...
Increase
29
KV is decreased in an AEC by 10 the density of exposure would
No change
30
The kVp of an AEC is increased by 10 the density of exposure would
No change
31
The CR in an AEC is moved from the proper place over soft tissue to a place over bone; the time for resulting exposure will
Increase
32
When a grid is used without changing technical factors the resulting image density will
Decrease
33
Grid Cutoff result in a ______ density
Decrease
34
I the detector in an AEC receives primary radiation from the useful beam the density of the resulting image would
Decrease
35
Improper positioning occurs during an AEC study the density o the resulting image would
Increase or decrease
36
The outer chambers are selected for an AP knee the density of the resulting image would
Decrease
37
Going from a grid to a non grid without changing the technique will _______ density
Increase
38
Going from a 12:1 grid to a 16:1 grid will ______ density
Decrease
39
Purpose of using a grid is to
Improve contrast
40
What is sensitomety
It permits analysis of ️️speed, contrast, and latitude within normal exposure ranges
41
Used to create a uniform set of densities on a film; creates optical step wedge
Sensitimeter
42
Provides measurement of light transmitted through film; measures optical density
Densitometr
43
Describes relationship between density an exposure
The D log E curve
44
Three other names for the D log E curve
Sensitometric curve Characteristic curve H&D (hunter and driffield) curve
45
Typical diagnostic densities range between
.25-2.5/3.0
46
What is base + fog
Is the density I film with no exposure just tint
47
The toe is controlled by what fast acting reducing agent in the developer
Phenidone
48
The shoulder is controlled by what slow acting reducing agent in developer
Hydroquinone
49
What agent produces gray tones on film
Phenidone
50
What agent produces black on images
Hydroquinone
51
Sensitometry permits analysis of
️️speed Contrast Latitude
52
The ability to accurately image an object
️Resolution
53
The relationship of resolution(detail, sharpness, definition, or resolving power) and size of crystal halides
Inverse
54
Film sensitivity is affected by and what is their relationship with film ️️speed
️size of crystal halides Number of sensitivity specks ️thickness of emulsion Direct relationship
55
Range of exposures that will produce densities in a diagnostic range
Latitude
56
Rare earth phosphors
Gadolinium | Lanthanum
57
Where is the radiation detector located on an ionization chamber
Between the pt and the IR
58
Where is the detector located on a photomultiplier
Behind IR
59
mA ⬆️ AEC time
⬇️
60
kVp ⬆️ AEC TIME
⬇️
61
SID ⬆️ AEC TIME
⬆️
62
Part ️size ⬆️ manual exp density
⬇️
63
Part ️size ⬆️AEC DENSITY
0
64
Part ️size ⬆️ AEC time
⬆️
65
mA ⬆️ manual density
⬆️
66
mA ⬆️ AEC DENSITY
0
67
kVp ⬆️ manual density
⬆️
68
kVp ⬆️ AEC DENSITY
0
69
SID ⬆️ manual density
⬇️
70
SID ⬆️ AEC DENSITY
0
71
Time ⬆️ manual density
⬆️
72
Time ⬆️ AEC DENSITY
⬆️ auto
73
Time ⬆️ time with ️AEC
Auto
74
Add heavy absorber; manual exposure density
0
75
Heavy absorber AEc DENSITY
⬆️
76
Heavy absorber ️AEC TIME
⬆️
77
Wrong centering MANUAL DENSITY
0
78
Wrong centering ️AEC DENSITY
⬆️⬇️ depends on situation
79
Wrong centering ️AEC time
⬆️⬇️depends on situation
80
Wrong detector selection/ table vs wall manual density
0
81
Wrong detector selection wall vs table ️AEC DENSITY
⬆️ back up timer
82
Wrong detector selection table vs wall ️AEC Time
⬆️
83
Density control⬆️ manual exposure
0
84
Density control ⬆️ AEC DENSITY
⬆️
85
Density control ⬆️ ️AEC TIME
⬆️
86
What effect does focal spot have on manual exposure density, AEC densities, and AEC time
0
87
Grid ratio ⬆️receptor exposure/density
⬇️
88
Grid lead content ⬆️ receptor exposure/density
⬇️
89
Using a grid; pt dose
⬆️
90
Grid Cut off; exposure density
⬇️
91
Grid ratio ⬆️ contrast
⬆️
92
The radiopaque strips found in grids are made of
Lead
93
The inter spaces of grids are made of
Aluminum or fiber
94
⬆️grid ratio ______ amount of scatter absorbed
⬆️
95
The relationship between the height of lead strips to the distance between the strips
️grid ratio
96
The number of grid lines per inch or centimeter
Grid frequency
97
Tube angled across long axis of grid strips (grid error)
Off level
98
When focused grid is used at a distance other than specified focal range (grid error)
Off focus
99
Focused grid used upside down will produce image in center only (grid error)
Upside down grid
100
Grid lines run in the same direction as movement of passé beam scanning image plate (grid error)
Moire effect

RAD 122 (3 decks)

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