RADT_153_Unit_4_Exam

RADT_153_Unit_4_Exam - RADT 153 Image Analysis Unit 4 The...

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Unformatted text preview: RADT 153 Image Analysis Unit 4 The Effects of Kilovoltage on Radiographic Quality Unit Exam 2 4.0 The Effects of Kilovoltage on Radiographic Quality Directions: 1. Write your name and the date on your Scantron form. Identify the subject as the course number (for example, RADT 153) along with the test number (for example, Unit 4). 2. For each of the questions below, select the best answer to the question. 3. Using a No. 2 pencil, fill in the appropriate answer on the answer sheet. 4. Erase unwanted answers completely. Questions with two or more filled in answer spaces are graded as incorrect. 5. Answer all questions. 6. You have a maximum 15 minutes to complete the following 25 questions. (Note: This time factor approximates the amount of time you would be allowed to answer the same number of questions on the Registry examination in radiography). 1. What does kVp stand for? A. B. C. D. 2. kilovolts kilovolt peak peak sine wave non of the above Which of the following does kVp affect? A. B. C. D. E. base penetrating ability quantity scatter radiation both B and C 3 3. Higher kVp techniques result in __________________________. A. B. C. D. E. 4. A lower kVp will produce fewer x-rays, each with less energy, a longer wavelength, and ____________________________. A. B. C. D. E. 5. shorter wavelength, higher frequency, deeper penetration shorter wavelength, lower frequency, deeper penetration long wavelength, high frequency, deeper penetration long wavelength, lower frequency, deeper penetration shorter wavelength, lower frequency, mild penetration Which does not have a direct affect to kilovoltage? A. B. C. D. E. 7. more penetrating power less penetrating power long scale of contrast lower contrast non of the above When using a high kVp, the focal spot of the anode will have _________________________________. A. B. C. D. E. 6. more x-rays produced x-rays with higher penetration x-rays of shorter wavelength all of the above only B and C contrast exposure latitude latitude density film contrast Large changes in kVp can alter tissue to the point where an image is so underexposed or overexposed it would be undiagnostic. A. B. True False 4 8. A higher kVp will produce an image with _______ density. A. B. C. D. E. 9. A lower kVp will produce an image with _________ density. A. B. C. D. E. 10. True False What causes fog? A. B. C. D. E. 13. 6% 2% 10% 8% 4% Changing the kVp from 70 to 80 will have an effect equal to approximately doubling of the radiographic density. A. B. 12. more lower midrange less no What percent of change in kVp will create an observable effect on a radiograph? A. B. C. D. E. 11. more lower midrange less no increasing the mAs increasing the kVp unwanted scatter leaving the cassette in the bucky tray non of the above Which of the following are used to reduce scatter radiation? A. B. C. D. E. aluminum plates lead aprons grids beam restrictors Both C and D are correct 5 14. What is contrast when applying it to radiology? A. the difference between varying shades of gray B. the range of difference between the blackest blacks and the whitest whites C. the densities D. all of the above E. non of the above 15. What are the components of radiographic contrast? A. B. C. D. E. 16. Which of the following does not dictate the type of subject contrast? A. B. C. D. E. 17. the type of examination the area of interest the type of pathology the patients past medical history None of the above kVp and contrast have an inverse relationship. A. B. 18. subject contrast, cassette contrast subject contrast, film contrast cassette contrast, film contrast subject contrast, manual contrast subject contrast, film emulsion contrast True False Scale of contrast is the quantity of _____________ within the density spectrum. A. B. C. D. E. long scale short scale scale of gray scale of white scale of black 6 19. Scale of contrast and kVp have an indirect relationship. A. B. 20. True False One of the following is an acceptable diagnostic viewing range. A. B. C. D. E. 21. At its extremes, latitude can be described as wide or ____________. A. B. C. D. E. 22. low high poor excellent narrow When a fairly broad range of exposure settings are capable of producing radiographs of diagnostic quality the exposure latitude is said to be __________ and the exposure error _______________. A. B. C. D. E. 23. 1.25 to 2.00 + base + fog 0.25 to 1.00 + base + fog 1.00 to 1.5 + base + fog 0.25 to 2.25 + base + fog 0 to 3.0 + base + fog wide, low narrow, high low, high decreased, increased optimum, optimum When a limited range of exposure settings are capable of producing radiographs of diagnostic quality the exposure latitude is said to be _______________ and the exposure error ____________________. A. B. C. D. E. wide, low narrow, high low, high increased, decreased poor, poor 7 24. With higher kVp the exposure latitude is __________ and the radiographer has a ____________ range in the selection of appropriate mAs. A. B. C. D. E. 25. wider, greater wider, lesser narrower, greater narrower, lesser non of the above kVp does not have an effect on geometric properties. A. B. True False ...
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