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Radiography Formulas Test

Enter the letter for the matching Answer
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1.
What is the 15% rule? How will I apply it, if repeating & wanting to keep the same the density?
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2.
What are the annual occupation limits for Effective Dose? How many mSv are in each rem? What are the limits in mSv? What is the occupational yearly dose limit for students under 18 years of age?
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3.
What is the qualitative factor (weighting factor) of the following radiations.....fast neutrons, alpha particles, protons, Dx x-rays & gamma rays? What is the ranking of Relative Biological Effectiveness (RBE) from least damaging to most?
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4.
What are the GCF for the following Grid ratios........No grid, 5:1 grid, 6:1 grid, 8:1 grid, 12:1 grid, 16:1 grid?
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5.
How does an decrease in kV affect exposure latitude? What does this mean?
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6.
What are the mAs correction factors when changing from single phase to 3 phase 6 pulse & 3 phase 12 pulse?
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7.
How can the size of a particular structure or image can be calculated?
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8.
Which of the following is likely to result from using single emulsion film in an IR that has 2 intensifying screens.....Double exposure, Decreased density, Increased recorded detail, Greater latitude? Why is this?
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9.
What is the Grid Frequency?
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10.
What is SOD the difference of?
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11.
What is the formula to calculate Equivalent Dose?
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12.
Can excessive radiographic density be attributed to over-development? Why?
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13.
How much kVp increase in technical factors for each increase of 1cm tissue thickness?
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14.
What is the formula used to determine the amount of image magnification?
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15.
what are the screen speed conversion factors for the following screen speeds mAs conversion factors, 50, 100, 200, 400, 800?
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16.
What is the formula for the Magnification Factor?
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17.
What is the formula to calculate Effective Dose?
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18.
In digital imaging, how is pixel size determined?
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19.
What is the formula for Density (Incident light & transmitted light)?
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20.
What is the Grid Ratio?
A.
Dx x-ray & gamma rays 1, protons 5, fast neutrons 10, alpha particles 20.
B.
By dividing the field of view (FOV) by the matrix. Pixel size = FV/Matrix
C.
Image size/Object Size = SID/OID
D.
screen spped 50=4, 100=2, 200=1, 400=0.5 & 800=0.25.
E.
An decrease in kV also decreases exposure latitude. There is less margin for error in lower kV ranges.
F.
MF = Image Size/Object Size
G.
Image size/Object size = SID/SOD
H.
For each 1cm increase of tissue thickness an increase of 2 kVp to compensate.
I.
Yes. Overdevelopment can be caused by the developer temp being too high, which results in chemical fog.
J.
Decreased density. If single emulsion film is in dual screen cassette, the film will only receive half the exposure.
K.
EqD = D x Wr. (D) dose, (Wr) Radiation weghting factor.
L.
A 15% increase of kV is equivalent to increasing mAs by 50%. A 15% decrease in kVp is equivalent to a 50% decrease in mAs. If repeating & wanting the same density, increase my kVp 15% & decrease my mAs by 50%.
M.
5 rem for the whole body, 50 rem for the skin & extremities, 15 rem for the lens of the eye. 1 rem = 10 mSv. 50 mSv for whole body. 500 mSv for skin/extrmities & 150 mSv for lens of the eye. 0.1 rem (100 mrem or 1 mSv) in given year for students under 18.
N.
Density = log x incident light intensity/transmitted light intensity
O.
SOD = SID - OID
P.
No grid = 1x the original mAs, 5:1 grid = 2x original mAs, 6:1 grid = 3x original mAs, 8:1 grid = 4x original mAs, 10:1 or 12:1 grid = 5x original mAs, 16:1 grid = 6x original mAs
Q.
The # of Pb (lead) strips per inch.
R.
EfD = D x Wr x Wt. (D) dose,(Wr) radiation weighting factor, (Wt) tissue weighting factor
S.
2/3 X for 3 phase 6 pulse & 1/2 X for 3 phase 12 pulse (X = single phase mass).
T.
GR = H/D (GR = Grid Ratio, H = Height of Pb stip, D = Distance of the interspace material between the Pb strips).

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