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Terms in this set (50)
Methods of acquiring a digital image include:
all of the above
A CCD is primarily made of which of the following substances?
The term pixel means:
All of the following are imaging properties of a CCD except one. Which one is the exception?
narrow dynamic range
Applications for CCD imaging include all of the following except one. Which one is the exception?
An x-ray machine that will be used with digital imaging should have all of the following characteristics except one. Which one is the exception?
large focal spot
Phosphor plate imaging is not quite as rapid as CCD imaging because:
A and C
"Processing" a digital image might include which of the following enhancements?
all of the above
Advantages of digital imaging over film-based imaging include all of the following except one. Which one is the exception?
elimination of the need for infection control
The area of the patient that is in focus and thus exhibited on a panoramic image is called the:
In general, film-based panoramic images have which of the following characteristics compared with film-based intraoral images?
less detail or resolution
Which of the following articles would a patient be allowed to wear during a panoramic exposure?
You notice a dark streak or band superimposed over the apices of the maxillary teeth on a panoramic image. Which of the following errors occurred during the exposure?
the patient's tongue was not contacting the hard palate
If a patient was positioned in a panoramic unit with his or her chin too high, which of the following would be seen on the resulting image?
flattened or reversed occlusal plane
A panoramic image shows very slender (narrow) and blurry anterior teeth. Which of the following errors was made during the exposure?
the patient was too far foward in the machine (too close to the image receptor)
A panoramic image shows an opaque (white) streak in the center of the film, from the bottom edge of the image to the level of the hard palate. You can still make out the teeth and bone in that area, but they are much harder to see than on the rest of the image. What error was made during the exposure?
the patient was not standing/sitting up straight
Which of the following anatomical landmarks would you expect to be seen on a panoramic and but is not normally present on an intraoral images?
Which of the following anatomic landmarks can be seen on both panoramic and intraoral images?
Which of the following anatomic structures is a single structure (there is only one of them) but can be seen more than once on a panoramic image?
You develop a set of bitewings in an automatic processor; three are fine, but one is totally blank (clear), with no hint of an image. What can you assume about the blank film?
it was not exposed to radiation
You look at the bitewings you took during Mrs. Jones's last appointment one year ago. The are brownish and somewhat opaque - not interpretable. What might be the cause of the discoloration? The films were:
not fixed or washed long enough
You turn on the water in the manual developing tanks at the beginning of the day, stir the solutions, check the temperature, and set the timer to go with the temperature. You develop a set of films at 9am that appear fine. Around 4pm, you process another set of films that are so dark that you can barely see images on them. What was the most likely cause of the appearance of the second set of films?
the water temperature changed
You take a set of bitewings and they all have a few little black spots on them. The most likely cause is
You notice that over the past few weeks the films have been getting lighter and lighter. No difference is noticeable from one day to the next, but there is a big difference between a periapical you took today and one that was taken 2 weeks ago. What is the most likely cause of this problem?
weak or contaminated developer
then notice a puddle on the counter near the automatic processor and you wipe it up with a paper towel, but do not rewash your hands. You then You have unwrapped a set of bitewing films in the darkroom with gloves on, disposed of the wrappings and the gloves, and washed your hands. Your load the bitewings into the automatic processor without gloves on. When the films are processed, there are dark fingerprints on them. What is the most likely cause?
the spill on the counter was developing solution, which got on your fingers from the paper towel, and then onto the films as you processed them
You are preparing to mount the complete mouth radiographic survey that you have laid out on the viewbox in front of you. You notice that one film is blank. The other films look normal except for one that seems darker than the others and has a rather peculiar-looking image on it. What is the most likely cause of this situation?
The dark film was double exposed and the blank one was unexposed
A patient has a very shallow palate and you are using the paralleling technique. You find you must tip the maxillary posterior periapical image receptors off parallel to get them into position. If the cone is aligned exactly with the indicator ring, what will the resulting images look like? .
they will be foreshortened
You notice that a maxillary premolar periapical view looks rather odd at its anterior aspect. The most apical portion of the canine root and the first premolar root look stretched out, like they were made of rubber and you pulled on them. The second premolar and the first molar look fine, as do all of the crowns of the teeth. What happened?
the anterior corner of the film was stuck to another film in the automatic processor
How will you know if you positioned a film backward (white side away from the x-ray beam)?
all of the above
Positioning the tongue flat against the hard palate for the duration of the panoramic exposure will minimize the appearance of which of the following air spaces?
What is the term given to an image of a structure that is recorded a second time, opposite of its location and with less sharpness?
Each of the following is likely to be observed in the maxillary anterior region on a panoramic radiograph EXCEPT:
middle cranial fossa
Each of the following is likely to be observed in the maxillary posterior region on a panoramic radiograph EXCEPT:
Each of the following is likely to be observed in the mandibular anterior region on a panoramic radiograph EXCEPT:
angle of the mandible
Each of the following is likely to be observed in the posterior region on a panoramic radiograph EXCEPT:
Which of the following is the most likely interpretation that fits this description: large bilateral circular radiolucency observed superior to or superimposed over the maxillary sinus, in the anterior region?
Which of the following is the most likely interpretation that fits this description: radiolucent depressed area of bone observed inferior to the roots of the mandibular anterior teeth?
A radiographic image of a dental restoration aids in each of the following EXCEPT:
identifying tooth surface location
It can be difficult to definitively identify type and size of a restoration recorded on a radiograph because radiographs represent a two-dimensional image of three-dimensional objects.
both the statement and the reason are correct and related
Which of these appear the least radiopaque?
Amalgam and a full metal crown can be distinguished from each other radiographically by:
shape and margins
Which of these dental restorative materials is most likely to mimic decay radiographically?
Which of the following is least likely to be detected radiographically?
elass ionomer sealant
A full metal crown appears radiographically as a rounded radiopacity that does not outline the anatomic shape of tooth cusps. A PFM crown presents a "see-through" radiopacity and does not appear to fit the tooth very well.
Both statements are false
Each of these uses of dental materials will appear about the same radiopacity as dentin EXCEPT:
Which of the following would NOT be observed within the pulp?
Caries appears radiopaque because more radiation passes through demineralization than through sound hard enamel.
the statement is not correct but the reason is correct
Caries in the earliest stage is called:
Radiographs are key to detecting incipient caries of which of these tooth surfaces?
Which of the following proximal surface caries appears radiographically as a radiolucent notch that extends less than halfway through the enamel?
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