記憶度
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問題一覧
1
Intensity is inversely proportional to the square of the distance
inverse square law
2
If the SID is reduced in half (e.g., 40 inches to 20 inches), the intensity or quantity of x-rays will increase by 4 times
true
3
A decreased in SID will result in:
increase magnification
4
Unsharp edges is referred to as
penumbra
5
Object appears shorter
foreshortening
6
Radiographic distortion can be categorized in which two ways?
size and shape distortion
7
Contrast with range of densities that are short
short scale contrast (high contrast)
8
Which factors affect x-ray quality?
kVp and filtration
9
Which of the following can you use to control spatial resolution
focal spot
10
The distance between the subject and IR:
OID
11
A doubling in kVp would result in four times more x rays emitted from the tube
true
12
The unit used to indicate the total quantity of x-rays in an exposure is:
mAs
13
Fog affects radiographic quality by causing
decreased contrast
14
If the SID is reduced by 50%, what will happen to x-ray intensity or quantity?
The intensity will increase 1/4
15
Which of the following will effect the quality of the x-ray beam?
kVp
16
The primary controller of radiographic density is:
mAs
17
A term used to describe a grainy or mottled image is
quantum mottle
18
The “fuzzy” unsharpness at the edges of structures or body parts is called:
penumbra
19
Two terms used to describe shape distortion:
foreshortening and elongation
20
The typical SID used in radiology departments today are:
40 and 72 inches
21
According to the inverse square law, if the SID is doubled (e.g., 40 inches to 80 inches), the intensity or quantity of x-rays will
decrease to one-fourth of the original intensity
22
The mass density of the body part is referred to as
tissue density
23
The principle factors that affect x-ray quantity are:
all of the above
24
High contrast can also be called
short scale contrast
25
Which of the following will result in increased radiographic density? 1. Increased mA 2. Increased exposure time 3. Decreased SID
1,2, and 3
26
The sharpness in the radiographic image is referred to as spatial resolution
true
27
The distance between the tube target and the IR:
SID
28
If the SID is doubled, what will happen to x ray intensity or quantity?
The intensity will decrease 1/4
29
A misrepresentation in the size or shape of the structure being examined is called:
distortion
30
Increased quantum little will result in increased spatial resolution
False
31
Motion of the patient, either voluntary or involuntary, during the exposure will result in decreased
spatial resolution
32
Magnification of a part
size distortion
33
List the five factors that will affect distortion
OID, SID, CR angle, Part position, and IR position
34
The prime factors of radiographic exposure:
mA, exposure time, kVp, SID
35
Contrast is influenced by:
fog and collimation
36
Quantum mottle occurs when:
either the kVp or mAs is set too low
37
The principal means of controlling involuntary motion is to
use a short exposure time
38
Object appears longer
elongation
39
Ranges of differences in the intensity of the x-ray beam after it has been attenuated by the patient:
subject contrast
40
Low contrast can also be called
long scale contrast
41
Another name for size distortion:
magnification
42
If the SID is increased or decreased, the density on the image is not changed
false
43
When the goal is to different between tissues that have very similar densities, is a long or short scale contrast most desirable
short scale contrast because it will enhance the difference between adjoining structures
44
If the max is doubled, the dose to the patient will:
double
45
If the radiographic image is too dark, which exposure factor(s) would you change to solve the problem?
mAs and SID
46
Which photographic factor makes the anatomy in the image visible?
Contrast
47
One means of controlling distortion is by control the:
part position
48
The factors that affect the quantity of x rays in the x ray beam are: 1. mAs 2. kVp 3. Anatomically programmed radiography
1 and 2
49
Three factors that will affect radiographic contrast
kVp, fog, and collimation
50
Generalized unwanted exposure on the image is called
fog
51
Contrast with range of densities that are long
long scale contrast (low contrast)
52
Milliamperage affects the
rate of exposure (quantity of x-ray production)
53
A solid piece of aluminum with steps of varying thickness:
penetrometer
54
Which factors affect x-ray quantity?
mAs, kVp, SID, and filtration
55
The digital term for density is
brightness
56
The term used to describe a light image:
underexposure
57
Primary controller of radiographic contrast
kVp
58
The term used to describe a dark image:
overexposure
59
Which technique factors, if adjusted upward, will increase density?
mAs and SID
60
Size distortion can be controlled by keeping ___ as low as possible
OID
61
The primary factor controlling radiographic contrast and x ray penetration is
kVp
62
Result of unequal magnification
shape distortion
63
List two possible causes when radiographic image appears gray and flat
contrast is too low and scatter radiation fog
64
The smaller the effective focal spot, the ___ the penumbra, and the ___ the spatial resolution
less, greater
65
When a large OID is used, spatial resolution can be improved by: 1. Decreasing the SID 2. Increasing the SID 3. Maintaining the small focal spot
2 and 3
66
The difference in radiographic density between any two adjacent portions of the image is called
contrast
67
List at least five factors that will increase spatial resolution in the radiographic image
decreasing OID, increasing SID, smaller effective focal spot, immobilization devices, and shorter exposure time
68
High contrast produced by using low kVp results in an image with:
a short-scale of contrast
69
The contrast on the viewing monitor is adjusted by controlling the window level
false