In each blank, try to type in the
word that is missing. If you've
typed in the correct word, the
blank will turn green.
If your not sure what answer should be entered, press the space bar and the next missing letter will be displayed. When you are all done, you should look back over all your answers and review the ones in red. These ones in red are the ones which you needed help on. Question: For every 1" of OID, how much in SID is required?Answer: For every 1" OID, an increase of 7" in SID is . Question: What is the for Density (Incident light & transmitted light)?Answer: Density = log x incident intensity/transmitted light intensity Question: What are the GCF for the Grid ratios........No grid, 5:1 grid, 6:1 grid, 8:1 grid, 12:1 grid, 16:1 grid?Answer: No grid = 1x the original mAs, 5:1 grid = 2x original mAs, 6:1 grid = 3x mAs, 8:1 grid = 4x original mAs, 10:1 or 12:1 grid = 5x original mAs, 16:1 grid = 6x original mAs Question: What formula is used when from one grid ratio to another?Answer: mAs original/mAs new = GCF /GCF new Question: In digital imaging, how is pixel size ?Answer: By the field of view (FOV) by the matrix. Pixel size = FV/Matrix Question: How can the size of a structure or image can be calculated?Answer: size/Object size = SID/SOD Question: What is SOD the of?Answer: SOD = SID - Question: What is the for the Magnification Factor?Answer: MF = Size/Object Size Question: What is the formula for Heat Units (HU) for single phase? What are the correction factors used for 3 phase 6 pulse & 3 phase 12 pulse? What % increase is the of the beam?Answer: HU = mA x Sec x kV. 3 phase 6 pulse 1.35 (35%) & 3 12 pulse 1.41 (41%). Question: What is the transformer law? What formula is used to determine the & current?Answer: Vs/Vp = Ns/Np (V=voltage & N=number of turns). to current...Ns/Np=Ip/Is (N=number of turns & I=current). Question: What is the Grid ?Answer: GR = H/D (GR = Grid , H = Height of Pb stip, D = Distance of the interspace material between the Pb strips). Question: What is the Grid ?Answer: The # of Pb (lead) per inch. Question: What are the mAs factors when changing from single phase to 3 phase 6 pulse & 3 phase 12 pulse?Answer: 2/3 X for 3 phase 6 pulse & 1/2 X for 3 phase 12 (X = single phase mass). Question: what are the speed conversion factors for the following screen speeds mAs conversion factors, 50, 100, 200, 400, 800?Answer: spped 50=4, 100=2, 200=1, 400=0.5 & 800=0.25. Question: How much kVp increase in technical factors for each of 1cm tissue thickness?Answer: For each 1cm increase of tissue thickness an of 2 kVp to compensate. Question: What is the 15% rule? How will I apply it, if repeating & wanting to keep the same the ?Answer: A 15% 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%. Question: What is the formula used to determine the amount of image ?Answer: size/Object Size = SID/OID Question: How can the SID be with the OID & SOD? How can the SOD be determined with the SID & OID? How can the OID be determined with the SID & SOD?Answer: SID = OID + SOD. SOD = SID - OID. OID = SID - SOD. Question: What is the to calculate Equivalent Dose?Answer: EqD = D x Wr. (D) dose, (Wr) weghting factor. Question: What is the Cumulative Effective Dose? What is the unit? How would it be determined? Answer: The Collective Effective Dose describes low doses of ionizing radiation exposure of a population or a group. The person-seivert. The # of x the average effective dose. Question: 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 of age?Answer: 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 year for students under 18. Question: What is the gestational dose limit for the embryo/fetus of a pregnant radiographer? What is the limit per month?Answer: 5 mSv (.5 rem) for the gestational period & not to exceed .5 mSv per (.005 rem, or 5 mrem). Question: Can radiographic density be attributed to over-development? Why?Answer: Yes. Overdevelopment can be by the developer temp being too high, which results in chemical fog. Question: Which of the following is likely to result from using single emulsion film in an IR that has 2 screens.....Double exposure, Decreased density, Increased recorded detail, Greater latitude? Why is this?Answer: Decreased density. If single emulsion film is in dual screen cassette, the film will only half the exposure. Question: How does an decrease in kV exposure latitude? What does this mean?Answer: An decrease in kV also exposure latitude. There is less margin for error in lower kV ranges. Question: What is the qualitative factor (weighting factor) of the following radiations.....fast neutrons, alpha particles, protons, Dx x-rays & rays? What is the ranking of Relative Biological Effectiveness (RBE) from least damaging to most?Answer: Dx x-ray & gamma rays 1, protons 5, fast neutrons 10, particles 20. Question: What is the square law?Answer: Old Intensity/New Intensity = New squared/Old Distance squared. Question: What is the density maintenance ?Answer: Old Intensity/New Intensity = Old Distance /New Distance squared Question: What is the formula to Effective Dose?Answer: EfD = D x Wr x Wt. (D) dose,(Wr) radiation weighting , (Wt) tissue weighting factor Question: Answer: Question: Answer: Question: Answer: Question: Answer: Question: Answer: |
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