Review
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| For every 1" of OID, how much compensation in SID is required? | show 🗑
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| show | Density = log x incident light intensity/transmitted light intensity
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| show | 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
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| show | mAs original/mAs new = GCF original/GCF new
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| In digital imaging, how is pixel size determined? | show 🗑
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| show | Image size/Object size = SID/SOD
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| What is SOD the difference of? | show 🗑
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| show | MF = Image Size/Object Size
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| show | HU = mA x Sec x kV. 3 phase 6 pulse 1.35 (35%) & 3 phase 12 pulse 1.41 (41%).
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| What is the transformer law? What formula is used to determine the voltage & current? | show 🗑
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| show | 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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| show | The # of Pb (lead) strips per inch.
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| show | 2/3 X for 3 phase 6 pulse & 1/2 X for 3 phase 12 pulse (X = single phase mass).
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| what are the screen speed conversion factors for the following screen speeds mAs conversion factors, 50, 100, 200, 400, 800? | show 🗑
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| show | For each 1cm increase of tissue thickness an increase of 2 kVp to compensate.
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| show | 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%.
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| What is the formula used to determine the amount of image magnification? | show 🗑
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| show | SID = OID + SOD. SOD = SID - OID. OID = SID - SOD.
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| What is the formula to calculate Equivalent Dose? | show 🗑
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| What is the Cumulative Effective Dose? What is the radiation unit? How would it be determined? | show 🗑
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| 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? | show 🗑
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| show | 5 mSv (.5 rem) for the gestational period & not to exceed .5 mSv per month (.005 rem, or 5 mrem).
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| Can excessive radiographic density be attributed to over-development? Why? | show 🗑
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| show | Decreased density. If single emulsion film is in dual screen cassette, the film will only receive half the exposure.
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| show | An decrease in kV also decreases exposure latitude. There is less margin for error in lower kV ranges.
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| show | Dx x-ray & gamma rays 1, protons 5, fast neutrons 10, alpha particles 20.
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| What is the inverse square law? | show 🗑
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| What is the density maintenance formula? | show 🗑
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| What is the formula to calculate Effective Dose? | show 🗑
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Created by:
jamestkelley
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