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Exposure Ch 18 Test

Enter the letter for the matching Answer
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1.
What does selectivity describe?
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2.
What is the "K" factor?
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3.
What is the purpose of the Grid?
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4.
What is a downfall of using a parallel linear grid?
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5.
What type of grid contains the greatest amount of lead and is most effeciant in absorbing radiation?
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6.
How do you find the Grid Ratio?
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7.
What are some types of grid patterns?
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8.
T\F: As the lead content increases, the removal of scatter decreases, and the contrast decreases
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9.
What is oscillating grid movement?
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10.
What is Grid Frequency?
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11.
What is the grid conversion factor?
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12.
Who improved the design of Grids, and how?
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13.
What is reciprocating grid movement?
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14.
With a high grid ratio, what scale of contrast is there?
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15.
What formula is used when converting from one grid ratio ot another?
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16.
T\F: high lead content grids are more selective.
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17.
What is Absorption responsable for?
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18.
T\F: Lower frequency grids have thinner lead strips.
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19.
What is the Potter-Bucky diaphragm, and what does it do?
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20.
What does the ICRU do?
A.
False : Higher frequency grids have thinner leas strips.
B.
short scale of contrast
C.
the light areas of a radiograph
D.
the ability of the grid to allow the primary radiation to reach the IR and prevent scatter
E.
the number of lead strips in the grid per inch or cm
F.
it is the Bucky we use today, it moves the grid during exposure.
G.
To improve radiographic contrast, To absorb scattered radiation before it reaches the IR
H.
High ratio, low frequency grids
I.
Grid Ratio = H/D
J.
a electromagnet that pulls the grid to the side and releases it during exposure.
K.
GCF = mAs with grid \ mAs without grid
L.
False: As the lead increases, removal of scatter increases, and contrast increases.
M.
the grid is moved back and fourth by a motor during exposure.
N.
Crosshatched, linear, Rombic, and consentric.
O.
the International Commission of Radiologic Units and Measurements evaluate grid performance by two criteria; selectivity and contrast imporvement ability.
P.
mAs of 1 over mAs of 2 = GCF of 1 over GCF of 2
Q.
True
R.
the contrast improvement ability which is a comparison of contrast of an image with a grid to that of an image without a grid
S.
Dr. Hollis Potter. He made the grid lines run in the same direction and made them move during exposure.
T.
absorbs a large amount of the primary beam.
Type the Answer that corresponds to the displayed Question.
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21.
What does improper alignment of the tube and the grid cause?
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22.
What are the types of linear grids?
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23.
What type of grid has a higher margin of error?
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24.
What is the typical grid ratio?
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25.
When the "K" factor is increased, what is incrased as well?
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26.
What happens to the density of a radiograph when a grid is used?
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27.
What are the typical ranges of the contrast improvement factor?
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28.
What does improper centering on a linear grid result in?
Type the Question that corresponds to the displayed Answer.
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29.
When the lead strips are angled to match the beam divergence

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