RADT_152_Unit_7_Exam

RADT_152_Unit_7_Exam - RADT 152 Radiation Protection Unit 7...

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Unformatted text preview: RADT 152 Radiation Protection Unit 7 Exam Protection of the Patient During Diagnostic Radiographic Procedures 2 7.0 Protection of the Patient During Diagnostic Radiographic Procedures Directions: 1. Write your name and the date on your scantron form. Identify the subject as the course number (for example, RADT 152) along with the test number (for example, Unit 7). 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. Which one of the following is a basic x-ray beam limiting device? A. B. C. D. E. 2. Aperture diaphragms Cones Cylinders Collimators All are correct What confines the primary beam before it enters the area of interest limiting the area of body tissue irradiated? A. B. C. D. E. X-ray beam limiting devices Cones Collimators Aperture diaphragms All are correct 3 3. What consists of a flat piece of lead with a hole of designated size and shape in the center that is placed directly below the window of the x-ray tube and reduces the amount of scatter? A. B. C. D. E. 4. The structure of a collimator is box shaped and contains a beam redefining system consisting of two sets of adjustable aluminum shutters mounted inside the device at different levels. A. B. 5. 10 cm 12 cm 9 cm 17 cm 15 cm What is the function of positive beam limitation (PBL)? A. B. C. D. 7. True False State the necessary distance between the patient and collimator to minimize skin exposure. A. B. C. D. E. 6. Cone Aperature diaphragm Cylander Collimator None of the above Collimators are automatically adjusted so that the radiation field matches the field size. Collimators are manually adjusted so that the radiation field matches the field size. Cones are automatically adjusted so that the radiation field matches the field size. Collimators are manually adjusted so that the radiation field matches the field size. Filtration of the x-ray beam reduces exposure to the patient’s skin and superficial tissue by absorbing most of the low energy photons from the heterogeneous beam. A. B. True False 4 8. Which answer best describes the types of filtration used in Radiography? A. B. C. D. E. 9. Identify the factor in determining the amount of filtration required. A. B. C. D. E. 10. 1.5 mm Aluminum equivalent 2.5 mm Aluminum equivalent 3.5 mm Aluminum equivalent 2 mm Aluminum equivalent The requirements of the Radiation Control for Health and Safety Act of 1968 includes that a diagnostic x-ray beam must always be adequately filtered and a measurement is obtained by a radiographic physicist at least every two years. A. B. 12. Milliamprage of a given x-ray unit Both mA and kV Peak kilovoltage of a given x-ray unit. Exposure Time Distance Identify the total filtration required for fixed units operating above 70 kVp A. B. C. D. 11. Inherent filtration Glass envelope encasing the x-ray tube, insulating oil, and glass window in the tube housing. Added filtration Sheets of aluminum located outside the glass window of the tube housing All are correct True False What is the purpose of protective shielding? A. B. C. D. E. Adequately attenuate ionizing radiation. Reduce or eliminate radiation dose that would otherwise result in biological damage Protect only the reproductive organs A and B are correct A, B, and C are correct 5 13. Which body organs and tissue require shielding? 1. 2. 3. A. B. C. D. 14. Lens of the eye Breast Reproductive Organs 1 only 2 only 1 and 3 1, 2, 3 When should gonadal shielding be used? A. B. C. D. 15. Which of following are types of gonadal shielding? A. B. C. D. E. 16. Gonadal shielding is always used unless it will compromise the diagnostic value of the beam Gonadal shielding is always used Gonadal shielding is never used Gonadal shielding is used only on women of child baring age Flat contact Shadow Shaped contact Clear lead All are correct Which of the following are technical exposure factor considerations? 1. 2. 3. 4. 5. 6. 7. Mass per unit volume of tissue of the area of clinical interest Effective atomic numbers and electron densities of the tissue involved. Film-screen combination SID Type and quality of filtration employed Type of x-ray generator used Balance of radiographic density and contrast required A. B. C. D. E. 1,2,3 2,3,4 1,2,3,4,5 4,5,6,7 1,2,3,4,5,6,7 6 17. The function of an intensifying screen is to enhance the action of xrays on film by converting them into visible light. A. B. 18. What is the effect of screen speed on exposure time? A. B. C. D. 19. True False Which of the following are ways to reduce patient dose in fluoroscopic procedures? 1. 2. 3. 4. 5. A. B. C. D. 21. The faster the screen speed, the longer the exposure time. The faster the screen speed, the shorter the exposure time. The slower the screen speed, the shorter the exposure time. None The removal of scatter radiation by a radiographic grid decreases radiographic detail. A. B. 20. True False Minimize patient exposure time Limit the size of the fluoroscopic field Employ the practice of intermittent, or pulsed, fluoroscopy Select the correct technical exposure factors Ensure that the source-to-tabletop distance is no less than 15 inches 1,2,3 1,3,5 1,3,4,5 1,2,3,4,5 One of the following is NOT a device that comes standard with the fluoroscopic machine to keep patient dose at a minimum. A. B. C. D. E. Filtration Cumulative timing device Exposure rate limitations. Collimation None of the above 7 22. The absorbed dose given to the most superficial layers of the skin. A. B. C. D. E. 23. Genetically Significant Dose (GSD) is the equivalent dose to the reproductive organs that, if received by every human, would be expected to bring about an identical gross genetic injury to the total population. A. B. 24. True False What is the first step that should be taken when radiographing a woman of child bearing age? A. B. C. D. 25. Skin dose Mid-line dose Exit dose Cumulative dose Effective dose Carefully question the patient regarding any possibility of pregnancy. Ask the patient to take a pregnancy test to see if she is pregnant. Always use gonadal shielding on female patients of child bearing age. Assume that the patient is not pregnant if she is in the Radiology department. What is the main concern that should be remembered about the developing embryo/fetus and radiation? A. B. C. D. E. A developing embryo-fetus is not sensitive to exposure from ionizing radiation. A developing embryo-fetus is sometimes sensitive to exposure from ionizing radiation. A developing embryo-fetus is especially sensitive to exposure from ionizing radiation. A developing embryo-fetus is as sensitive to radiation as a 25 year old female. There is not a concern with embryo/fetus and radiation. ...
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This note was uploaded on 11/12/2011 for the course RADIOLOGY 152 taught by Professor Walters during the Spring '11 term at Boise State.

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