RADT_153_Unit_9_Exam

RADT_153_Unit_9_Exam - RADT 153 Image Analysis Unit 9 Exam...

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Unformatted text preview: RADT 153 Image Analysis Unit 9 Exam The Effects of Beam Restrictors on Radiographic Quality 2 Directions: 1. Write your name and the date on your Scantron form. Identify the subject as the course number (for example, RADT 150) along with the test number (for example, Unit 1). 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 is the purpose of beam restrictors? A. B. C. D. 2. By reducing the amount of radiation reaching the patient, patient exposure is thereby: A. B. C. D. E. 3. Limits the field of radiation Does not allow x-rays to be taken It has no purpose Blocks all radiation Increased The same Decreased Doubled None Which of the following is not a beam restricting device? A. B. C. D. Flare cones Lead diaphragms Collimators Film 3 E. 4. The two other names used for lead diaphragms are aperture diaphragms and diaphragms. A. B. 5. Flared cones Lead diaphragms Extension cylinders Collimators Grids Which if the following is not true about flare cones? A. B. C. D. 8. Lead is soft and it bends easily They had round openings They had square openings There was no guarantee that the right size was being used Both A and C Pieces of lead with circular openings of different sizes that could be inserted into slots directly below the x-ray tube describes: A. B. C. D. E. 7. True False Which of the following is not true about lead diaphragms? A. B. C. D. E. 6. Extension cylinders No assurance that the tube was properly positioned over the part. No assurance that a cone had been attached. Flare cones are never used No assurance that the cone was the correct one for the film being used. Attaching just beneath the x-ray tube held temporarily in place by a thumbscrew type flange, and being megaphone shaped is the definition for: A. B. C. D. E. Collimators Grids Extension cylinders Diaphragms Flared cones 4 9. The advantage of using a flare cone was the ability to: A. B. C. D. 10. Cones are still commonly used in fluoroscopy. A. B. 11. Size Shape Width Height Weight A permanently mounted metal box attached to the underside of the x-ray tube housing containing at least 2 pairs of lead shutters with a light source and reflecting mirror for indicating radiation field size and central ray alignment is the definition for: A. B. C. D. E. 14. Collimators Extension cylinders Flared cones Lead diaphragms Grids The disadvantages of an extension cylinder is the imprecise alignment and the: A. B. C. D. E. 13. True False _____________ could produce smaller size radiation fields than even the longest, narrowest flare cone. A. B. C. D. E. 12. Assure the tube was properly positioned over the part Perfectly center under the tube Assure the cone was the correct one for the film being used Assure that a cone had been attached Collimator Lead diaphragms Extension cylinder Flared cones Grids Which of the following is not true about the collimator? A. B. C. Light bulbs fail Installation can be difficult They are used as a last resort 5 D. 15. The Department of Health and Human Resources required x-ray units to have ____________ in August of 1974. A. B. C. D. E. 16. Automatic exposure control Indicator light switch control Misalignment Automatic beam restriction Since eliminating the production of scatter radiation will decrease the number of photons reaching the film, density increases. A. B. 19. Collimation Automatic exposure control Positive beam limitation Proper grid alignment Extension cylinders ___________________ indicates that an adjustment of the light source or reflecting mirror is needed. A. B. C. D. 18. Collimators Positive beam limitation Bucky trays Grid alignment Automated detent ________________________ means that the collimator will either automatically adjust to the size of the film through sensing switches and relays in the Bucky tray, or the unit will fail to take the exposure until the collimator is manually adjusted to the size of the film. A. B. C. D. E. 17. Misalignment can occur between the light field and radiation field. True False What is the relationship between radiation field size and density? A. B. C. D. Direct Inverse None The same 6 20. When is the total quantity of scatter radiation reaching the film near its maximum? A. B. C. D. E. 21. Short scale, low contrast radiographs Long scale, low contrast radiographs Long scale, high contrast radiographs Short scale, high contrast radiographs Short scale Long scale High contrast Both A and C Both B and C Direct Inverse None The same Beam restricting devices do not have an effect on recorded detail because the presence of anatomical structures is not what constitutes image sharpness. A. B. 25. cm cm cm cm cm What is the relationship between filed size and subject contrast? A. B. C. D. 24. 10 15 30 40 50 What type of radiograph will be produced if you remove the source of scatter radiation? A. B. C. D. E. 23. by by by by by What do intermediate shades of gray produced by scatter radiation result in? A. B. C. D. 22. 10 15 30 40 50 True False What is the relationship between field size and image size? A. B. C. D. Inverse Direct None The same ...
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