RADT_153_Unit_10_Exam - RADT 153 Image Analysis Unit 10...

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Unformatted text preview: RADT 153 Image Analysis Unit 10 Exam The Effects of Tube-Object-Film Alignment on Radiographic Quality 2 10.0 The Effects of Tube-Object-Film Alignment on Radiographic Quality Unit Exam Directions: 1. Write your name and the date on your Scantron form. Identify the subject as the course number (for example, RADT 101) 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. A perpendicular central ray directed to the center of the___________ gives optimal alignment with the cassette. A. B. C. D. E. 2. patient film bucky tray wall bucky body part being radiographed When the structure identified as the center of the image for any given projection is aligned under the central ray and over the film midpoint, optimal_______________ will be achieved. A. B. C. D. E. density contrast alignment detail clarity 3 3. Which of these is NOT a component of radiographic alignment that must be geometrically correct in order to obtain optimum radiographic imaging? A. B. C. D. E. 4. Which of these is verified when the film is in direct line of sight and can easily be seen immediately below the body part? A. B. C. D. E. 5. D. E. The point The point The point beam. The point The point must be under the collimator light field. must be on the centerline of the table. must be under the central ray of the primary must be in the center of the cassette. must be under the cathode side of the tube. What on the collimator’s light field serves to dramatically reduce the number of errors of patient misalignment? A. B. C. D. E. 7. OID SID body part over the center line optimal density alignment Which of the following is an anatomical centering point? A. B. C. 6. tube beam collimator object film none of the above adjustable knobs the central ray the primary beam the cross hairs film Bucky work should be completed in any way that is most comfortable to the radiographer since direct line of sight is lost with the film. A. B. True False 4 8. Failure to _________________________________ is an occasional problem with using the Bucky. A. B. C. D. E. 9. The “floating” tabletop functions to: A. B. C. D. E. 10. rotate smoothly in a vertical plane tilt patients for fluoroscopy transfer patients between rooms rotate 360 degrees end to end roll smoothly in any horizontal plane How does the floating table top assist the radiographer in finding the center of the bucky? A. B. C. D. E. 11. center the ray center the patient over the film adjust the settings mark the film completely close the film tray The detent locks hault the tube once the centerline of the bucky is reached. Depressing the transverse button will automatically move the bucky to center. Depressing the detent button moves the bucky to the center of the table. Depressing the center button automatically moves the bucky to the center of the table. The detent locks release the tray and allow it to move to the center of the table. How does a radiographer find the center of the bucky while doing upright work (Horizontal Rays)? A. B. C. D. E. a beep sounds once center is found a mark is established on the overhead track a light comes on once center is found the tray is always centered during upright work the tray stops movement once center is reached 5 12. A radiographer must rely on ___________ and _____________when dealing with a portable unit while properly positioning the x-ray tube. A. B. C. D. E. 13. The measurement of the light field from the collimator on either side of the body part is defined as: A. B. C. D. E. 14. True False In a portable situation, what is of special help if part of the film holder is lost from view under the patient? A. B. C. D. E. 16. SID OID centering the central ray framing decubitus If the light field is unequal on the two sides of the film, and the film is in the proper place, the x-ray tube needs to be moved in the direction that will make the light fields equal on both sides and the patient needs to be moved more central, within the light field. A. B. 15. speed, accuracy speed, timing experience, accuracy knowledge, timing experience, knowledge a tape measure fluoroscopy painted markings an assistant to help hold a tilting bed Even when proper centering is realized, _______________ can result. A. B. C. D. E. uneven collimation shape distortion uneven densities misaligning the patient scatter 6 17. The enlargement of different parts of a structure by different amounts defines: A. B. C. D. E. 18. In order to correct most shape distortion, some structures require the body to be ____________ to free that part from superimposition. A. B. C. D. E. 19. the the the the the clavicles scapulas ribs heart vertebrae When angulation is used to minimize object-to-film distance, the radiograph’s image may: A. B. C. D. E. 21. prone supine decubed lateral oblique Obliquing is used for the sternum to avoid superimposition with: A. B. C. D. E. 20. penumbra effect OID contrast shape distortion foreshortening darken elongate have less detail have increased artifacts have motion The lengthening of the image size is _______________ and the amount of the image size reduction is ________________. A. B. C. D. E. OID/SID foreshortening/elongation distortion/artifact increased density/decreased density elongation/foreshortening 7 22. When patient weight or the bed itself causes the plane of the film to be unparallel to the floor, _____________ of the tube is necessary to obtain a perpendicular angle to the plane of the _______________. A. B. C. D. E. increased distance/filmholder angulation/filmholder angulation/patient elongation/patient elongation/filmholder ...
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This note was uploaded on 11/12/2011 for the course RADIOLOGY 153 taught by Professor Walters during the Spring '11 term at Boise State.

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