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18 Cards in this Set
- Front
- Back
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Which of these is a limitation of a panoramic radiograph when compared to an intraoral radiograph?
a. Larger radiation dose to the patient. b. Increased time required for exposure. c. Superimposition of structures may make interpretation difficult. d. Requires an increase in patient instruction and cooperation with the procedure. |
c. Superimposition of structures may make interpretation difficult.
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What is the term given to the technique where a slice of tissue is exposed distinctly, whereas structures outside the designated area are blurred out of the image?
a. Ghost image b. Artifact c. Focal trough d. Tomography |
d. Tomography
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All panoramic radiographs have 10 to 30 percent magnification. It is desirable to keep the magnification less in the anterior region and greater in the posterior region.
a. The first statement is true. The second statement is false. b. The first statement is false. The second statement is true. c. Both statements are true. d. Both statements are false. |
a. The first statement is true. The second statement is false.
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The panoramic PID is collimated to what shape?
a. Round b. Rectangular c. Narrow slit |
c. Narrow slit
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What term is given to the area where structures will be imaged with relative clarity, whereas structures outside this area are blurred out of the image?
a. Ghost image b. Artifact c. Focal trough d. Tomography |
c. Focal trough
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Each of the following is a component of the panoramic x-ray machine EXCEPT one. Which one is the EXCEPTION?
a. Rotational x-ray tube head b. Cassette holder or built-in digital sensor c. Head positioner guides d. Variable exposure timer |
d. Variable exposure timer
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Which dimension of the focal trough does the biteblock of the panoramic x-ray machine assist the operator with positioning?
a. Anterior–posterior b. Lateral (left–right) c. Superior–inferior |
a. Anterior–posterior
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Which of the following planes is used to position the patient correctly within the superior–inferior (up–down) dimension?
a. Ala–tragus line b. Frankfort plane c. Midsaggital plane d. Both (a) and (b) |
d. Both (a) and (b)
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Which of the following positioning errors results in anterior teeth that are blurry and narrowed in size?
a. Too far forward in the focal trough b. Too far backward in the focal trough c. Too far to the left in the focal trough d. Too far to the right in the focal trough |
a. Too far forward in the focal trough
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When the dental arches are rotated to the left, the teeth on the right side will be positioned closer to the image receptor. The teeth closer to the image receptor will appear blurry and magnified.
a. The first statement is true. The second statement is false. b. The first statement is false. The second statement is true. c. Both statements are true. d. Both statements are false. |
d. Both statements are false.
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Which of the following positioning errors results in an exaggerated “smile” appearance of the arches?
a. Midsaggital plane tipped to the left b. Midsaggital plane tipped to the right c. Chin tipped too far up d. Chin tipped too far down |
d. Chin tipped too far down
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The appearance of a large radiolucency that obscures the maxillary teeth apices results when
a. the lips are not closed around the biteblock during exposure. b. the tongue is not resting on the palate during exposure. c. the lead thyroid collar gets in the way of the primary beam. d. facial jewelry (e.g., oral piercing) is not removed prior to exposure. |
b. the tongue is not resting on the palate during exposure.
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Which of the following appears radiolucent on a panoramic radiograph?
a. Nasal cavity b. Nasal septum c. Nasal spine d. Hard palate |
a. Nasal cavity
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16. Which of the following appears radiopaque on the panoramic radiograph?
a. External auditory meatus b. Zygomatic process of the maxilla c. Mental fossa d. Mandibular foramen |
b. Zygomatic process of the maxilla
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Which of the following could be called a negative shadow?
a. Tongue b. Ghost image c. Glossopharyngeal air space d. Biteblock |
c. Glossopharyngeal air space
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List three air spaces that may be recorded on panoramic radiographs.
a. ___________________________ b. ___________________________ c. ___________________________ |
a. Glossopharyngeal air space
b. Nasopharyngeal air space c. Palatoglossal air space |
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List three machine parts that may be recorded on panoramic radiographs.
a. _________________________ b. _________________________ c. _________________________ |
a. chin rest
b. side head positioner guides c. biteblock |
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What is the term given to a structure that is recorded a second time, with less sharpness, and on the opposite side?
a. Ghost image b. Focal trough c. Split image d. Tomograph |
a. Ghost image
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