Card Set Information

2010-12-15 18:00:57
Final Review Week four

Ch. eight, nine, twenty seven
Show Answers:

  1. What strucure will appear most radiolucent on a radiograph?
    air space
  2. Many areas of black and white = __________ scale contrast, and ________ contrast
    • short
    • high
  3. Many areas of gray = _______ scale contrast, and ________ contrast
    • long
    • low
  4. The stepwedge can be used to demonstrate __________. It can also be used to monitor the ________ of film and film processing
    • contrast
    • quality
  5. the _______ _______ of the ________ serves as a focal spot and converts electrons into x-ray photons
    • tungsten target
    • anode
  6. The _______ the focal spot the sharper the image. Also, the emulsion of faster films contain __________ crystals that produce ________ image sharpness
    • smaller
    • larger
    • less
  7. a decrease in object-film distance = a ______ in magnification
  8. What portion of the silver halide crystals is chemically removed during the reduction process of film processing?
    halide portion of the exposed energized silver halide crystals
  9. What results in precipitated black metalic silver?
    reduction of the exposed silver halide crystals
  10. true or false. selective reduction refers to the reduction of the energized exposed silver halide crystals into black metallic silver, while the unenergized unexposed silver halide crystals are removed from the film
  11. White areas on the film result from the removal of ___________ by the __________ solution
    • unexposed silver halide crystals
    • fixer
  12. When does the film emulsion harden?
    during fixation by the fixer solution
  13. Both powder and liquid concentrate forms of film processing solutions must be mixed with ____________
    distilled water
  14. How often should the film processing solutions be replenished? Changed?
    • daily
    • every 3-4 weeks
  15. What is the optimum temperature for developing?
  16. What is the purpose of the restrainer?
    to control the developer, and prevent it from developing the exposed and unexposed crystals
  17. true or false. The restrainer in the developer solution stops the development of both unexposed and exposed crystals, it is most effective in stopping the development of the unexposed crystals
  18. What is about the average amount of films that are processed in a day?
  19. What is the purpose of the hardening agent in the fixer solution?
    harden and shrink the gelatin in film emulsion
  20. Films that are unwrapped too close to the safe light for more than ____ -_____ minutes appear fogged. Also, a safelight must be placed a minimum of ______ feet away from the film and working area
    • 2-3
    • 4
  21. weakened or exhausted developer solution produces what?
    weakened or exhausted fixer solution produces what?
    • film with reduced density and contrast
    • films can turn a yellow or brown color
  22. How often should the automatic film processor be cleaned
    daily to weekly
  23. an extraoral sized cleaning film removes any ________________ or ______ from the rollers of the automatic processor
    • residual gelatin
    • dirt
  24. Developer spots are ______ spots on the film. Fixer spots are _________ spots on the film
    • dark
    • white
  25. What is the appearance of static electricity on the film?
    black, thin, branching lines
  26. What will help you view the films better once they are mounted?
    removing extraneous light
  27. When and where should films be mounted?
    infront of the patient, immediately after processing, and in an area equiped for mounting
  28. curve of spee curves________towards the distal
  29. If you have higher temperature you should ________ developer time