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RADT 456 Test

Enter the letter for the matching Answer
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1.
Is there better recorded detail with a faster or slower screen speed?
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2.
What is grid frequency?
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3.
Give three examples of destructive pathologies that technique may need to be reduced.
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4.
Is the effective focal spot smaller or larger than the actual focal spot?
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5.
To produce a perceptible change in density, how much would the mAs have to change?
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6.
If twice the original density is needed, what percentage should kV be increased?
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7.
What is the function of contrast scale?
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8.
When changing from single phase to three phase 12 pulse, what decrease of mAs is needed?
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9.
What are the radiographic geometric factors?
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10.
The collimator box accounts for how much filtration of the primary beam?
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11.
If phosphor size increases, does screen speed increase?
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12.
If no grid is used on a large body part, what percentage of scatter radiation contributes to the total IR exposure?
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13.
Do phosphors with a high atomic number have a slower or greater speed?
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14.
If the mAs is doubled, what happens to the density?
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15.
Does optical density increase/decrease as developer temperature increases?
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16.
Spatial resolution is measured in what?
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17.
What is the best method of minimizing voluntary motion?
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18.
A 10 inch air-gap produces the same effect as what type of grid?
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19.
Is there a larger or smaller margin of error when selecting higher kV?
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20.
Does unsharpness increase as focal spot size increases or decreases?
A.
Cut the mAs in half. Pg. 338.
B.
Line pairs per millimeter (lp/mm). Pg. 296.
C.
50% of the image is scatter radiation. Pg. 326.
D.
A 16:1 grid. Pg. 331.
E.
Optical density increases. Pg. 341.
F.
Screen speed and phosphor size are directly related. The bigger the phosphor the faster the screen speed. Pg. 312.
G.
The mAs would have to change at least 30%. Pg. 319.
H.
You would need to increase the kV by 15% to see a increase in density. Pg. 323.
I.
Recorded detail and distortion. Pg. 296.
J.
There is a larger margin for error. Pg. 345.
K.
They have a greater speed. Pg. 311.
L.
As screen speed increases, recorded detail decreases. Pg. 312
M.
Emphysema, degenerative arthritis, and osteoporosis. Pg. 335.
N.
Good communication and suspended respiration. Pg. 307.
O.
To make image details visible. Pg. 342.
P.
Unsharpness increases as focal spot size increases. Pg. 303.
Q.
The effective focal spot will always be smaller than the actual focal spot per the line focus principle. Pg. 307.
R.
The density doubles as well. Pg. 319.
S.
1.0 mm Al equivalent. Pg. 332.
T.
Grid frequency is the number of lead strips per inch. Pg. 329.
Type the Answer that corresponds to the displayed Question.
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21.
What is the single most important way to reduce scatter radiation?

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