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Radiology

5-Jolene

QuestionAnswer
1. List all components of exposure technique. film position, alignment of vertical and horizontal angle and centering beam
2. What is considered the apical area for diagnostic purposes? apex plus 3 - 4 mm of surrounding bone
3. What is the term for having to redo the radiograph? retake or remake
4. Which technique error causes overlapping of contacts? incorrect horizontal angle
5. Which technique error causes foreshortening of the image on a radiograph? too much vertical angle
6. Which technique error causes elongation of the image on a radiograph? too little vertical angle
7. Which technique error causes a cone cut on the radiograph? beam not centered with film
8. What can cause a film image to be light? too little exposure (time or mA or kVp or a combination), too little development, cold chemicals
9. What can cause a film image to be dark? too much exposure (time or mA or kVp or a combination), too much development, hot chemicals
10. What will be the result on the radiograph if the film was placed backwards in the mouth? light image with faint detail of lead foil embossed pattern
11. What is the most likely cause for a dark, slightly curved mark on the radiograph? fingernail pressure
12. What is the appearance of a radiograph that has been contaminated with fixer prior to processing? white blotches
13. If the film has been handled with fingers contaminated with fluoride gel prior to processing, what will be the result on the radiograph? dark spots or dark fingerprint image
14. What could cause a crimping artifact? hemostat pressure marks
15. List all of the factors influencing film density. mA, kVp, exposure time, PID length, film speed, tissue density, processing technique
16. What is the correction for a foreshortened image? decrease the vertical angle
17. What is the correction for an elongated image? increase the vertical angle
18. What is the correction for overlapping of contacts? redirect the horizontal angle throught the contact
19. Which teeth should be present on a premolar periapical radiograph? distal of canine (1/3 to 1/2); premolars - usually the first molar is also included, but not required
20. Which teeth should be present on a molar periapical radiograph? third molar area and second molar; first molar (may not show the mesial of first molar)
21. The distal of the canine is missing from a premolar periapical. If the canine is present in the mouth and can be seen on the bitewing, is this an error? yes - it is a film placement error
22. The third molars have been extracted. Do the third molar areas need to be present on the molar periapicals? yes - 3rd molar areas need to present on all molar radiographs
23. How much bone structure must surround the apex of the tooth for a diagnostically acceptable radiograph? 3 - 4 mm
Created by: Sandys