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Stack #132647 Test

Enter the letter for the matching Answer
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1.
How does KVP affect density?
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2.
When making contrast changes on a radiograph, what changes in KVP should be made?
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3.
What factor causes foreshortening of the radiographic image?
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4.
What is different degrees of absorption in adjacent tissues that result in image contrast?
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5.
What factors secondarily influence density?
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6.
What are the two factors that control size distortion (magnification)?
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7.
Why should KVP not be used to control density?
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8.
What is most often the cause of motion blur?
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9.
What effect does doubling the SID have on density?
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10.
What effect do grids have on contrast?
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11.
What is the exception to the Reciprocity Law?
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12.
What is considered the useful range of optical densities?
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13.
Increasing or decreasing the contrast does what to density?
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14.
What is the primary controlling factor for contrast?
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15.
What factors cause elongation of an object?
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16.
What is the overall blackening of the film from the black metallic silver deposited in the emulsion?
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17.
What is the ability to image an object with accuracy?
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18.
Which formula should be used to maintain density when making distance changes?
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19.
How does tissue thickness affect density?
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20.
What term means the misrepresentation of the size or shape of a structure recorded in the radiographic image?
A.
misalignment of the tube or film
B.
differential absorption
C.
improves contrast by removing scatter before it reaches the film which results in a shorter scale of contrast
D.
density remains the same
E.
Density maintenance formula: MAS1/MAS2=D1(D1)/D2(D2)
F.
Density is reduced to 1/4
G.
patient motion; motion of the x-ray tube is not a problem
H.
Changes should be made in increments of 8 or 15%
I.
KVP, distance, beam restriction, anatomic part, grid, film/screen combination, processing, anode heel affect
J.
changing KVP also changes contrast
K.
SID and OID
L.
distortion
M.
Directly, as KVP increases density increases because penetrability increases so more photons are reaching the IR
N.
Extreme exposure times (more than 10s or less than 10ms with use of intensifying screen
O.
resolution also called recorded detail
P.
KVP
Q.
misalignment of the part
R.
0.25 to 2.5
S.
There is an inverse relationship; as tissue thickness, average atomic number, and/or tissue density increases, radiographic density decreases
T.
radiographic density (optical density)
Type the Answer that corresponds to the displayed Question.
incorrect
21.
What is the difference between adjacent densities within the radiographic image?
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22.
What is the absorption of x-rays in the heel of the anode which results in decreased x-ray intensity of the anode side of the central ray?
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23.
What is the enlargement of the recorded image as compared to the actual size of the structure?
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24.
What is the loss of radiographic quality caused by movement of the patient or x-ray tube during exposure?
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25.
What is the enlargement of the recorded image as compared to the actual size of the structure?
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26.
What is the imperfect unsharp shadow caused by size of the focal spot (replaces the terms penumbra and geometric unsharpness)?
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27.
What is the misrepresentation (elongated or foreshortened) of the shape of the structure recorded as compared to the actual shape of the structure?
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28.
What change in KVP is needed to make a visible change in contrast?
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29.
Which of the two types of contrast is a product of low KVP?
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30.
What refers to the random nature in which x-rays interact with image receptor and occurs with the use of high speed screens with very low mas and high KVP and causes a grainy appearance of the image?

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