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Radiology

3-Jolene

QuestionAnswer
1. What is meant by the latent image? image on exposed film before processing.
2. What is meant by a visible image? exposed, processed film that can be viewed with proper lighting
3. Which film is faster, E or D? E
4. What is meant by film speed? amount of exposure (time) required to expose the film
5. What determines film speed? size/shape of silver halides; thickness of emulsion; radiosensitizing dyes
6. Which part of the film is sensitive to exposure? silver halides in the emulsion
7. List all of the things that can expose film. x-ray, light, scatter radiation, heat, age, pressure, chemicals, static electricity
8. What happen to the radiographic image if exposed to extraneous light during processing? fogged film
9. What is the result of leaving films in the developer too long? darker image (higher density image) - may turn completely black
10. What is the result of leaving films in the fixer too long? lighter image (lower density image) - film may be completely cleared
11. What is the ideal time and temperature for manual development? 68 degrees Fahrenheit for 4.5 - 5 minutes
12. What is the total time for fixing films using manual processing? 10 minutes
13. What is the purpose for rinsing films between developing and fixing? remove excess developer and stop the developing process
14. Why are films not rinsed after development in automatic processing? rollers remove the developer
15. What are the special qualities of automatic processing chemicals? control swelling of emulsion; more concentrated; more preservatives
16. What information should be placed on the rack for manual processing? patient name and date of exposure (usually name of prescribing dentist, also)
17. What is a coin test? open film; place coin on top; expose to safelight or no light for 5 minutes; process; view
18. What is the purpose of the coin test? test for extraneous light exposure
19. What is a step wedge? aluminum or other metal of varying thicknesses built in steps
20. How is the step wedge used in a quality assurance program? expose quality assurance and checker films to test chemicals
21. What is the purpose for quality assurance of the processing chemicals? produce optimal patient radiographs
22. What is replenishment? remove some old chemicals; replace with new solutions
23. What is the minimum recommendation for frequency of replenishment? daily
24. What is able to expose dental film? x-ray, light, scatter radiation, heat, age, pressure, chemicals, static electricity
25. What happens to silver halides during developing? exposed ones darken
26. What happens to silver halides during fixing? unexposed/undeveloped silver halides are removed
27. How will films be affected if the developing solution is too hot? darken
28. How will films be affected if the developing solution is too cold? underdeveloped/low density/too light in appearance.
29. What type of darkroom door allows for people to enter and exit without light entering? revolving
30. What are the specifications for a safelight that is safe for both intraoral and extraoral film? 4 feet from work surface; 15 watt bulb; GBX-2 filter
31. How would you test a daylight loading processor for light safeness? coin test
32. What type of Kodak film has a purple color on the backside? duplicating
33. What is the purpose for lead foil in the film packet? absorb backscatter radiation and prevent film fog
34. What is the new speed of film for Kodak film? F
35. What would you do to darken the image when making a duplicate film? expose it to less light during duplication
36. What are the specifications for film storage? 50 - 70 degrees Fahrenheit; 30-50% relative humidity; use before expiration date
37. What does it mean when an image results from a coin test film? light exposure has occurred
Created by: Sandys