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Radiography Formulas Quiz

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1. What is the Cumulative Effective Dose? What is the radiation unit? How would it be determined?




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2. 




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3. What is the formula for Density (Incident light & transmitted light)?




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4. 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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5. What are the mAs correction factors when changing from single phase to 3 phase 6 pulse & 3 phase 12 pulse?




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6. What is the gestational dose equivalent limit for the embryo/fetus of a pregnant radiographer? What is the limit per month?




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7. How does an decrease in kV affect exposure latitude? What does this mean?




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8. 




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9. What is the 15% rule? How will I apply it, if repeating & wanting to keep the same the density?




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10. What formula is used when converting from one grid ratio to another?




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11. 




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12. EfD = D x Wr x Wt. (D) dose,(Wr) radiation weighting factor, (Wt) tissue weighting factor




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13. SOD = SID - OID




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14. Image size/Object size = SID/SOD




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15. EqD = D x Wr. (D) dose, (Wr) Radiation weghting factor.




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16. Image size/Object Size = SID/OID




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17. For every 1" OID, an increase of 7" in SID is required.




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18. The # of Pb (lead) strips per inch.




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19. SID = OID + SOD. SOD = SID - OID. OID = SID - SOD.




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20. screen spped 50=4, 100=2, 200=1, 400=0.5 & 800=0.25.





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