B- Technique: Orbits, Nasal bones, Zygomatic Arches

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20 Terms

1
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CR of a lateral projection of the orbits
Outer canthus
2
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To reduce magnification and reduce artifacts, what is not used when performing a lateral orbits projection
grid
3
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A projection for the orbits wherein the tube is angulated 30 degrees caudad and the CR exits 3/4 inches below the nasion
Modified Caldwell or PA Axial
4
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where is the central ray directed for a modified caldwell (Orbits)?
3/4 inch below the nasion
5
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Where are the petrous ridges seen on a PA Axial/Modified Caldwell projection of the orbits?
Below the orbital margins
6
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Where does the CR exit on a modified waters (orbits)?
midorbital level
7
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Where are the petrous ridges seen in a modified waters projection (orbits)
middle of the maxillary sinuses
8
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where does the CR enter on a lateral nasal projection?
1/2 inch distal to the nasion
9
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How is the patient positioned during a lateral nasal projection
RAO/LAO
10
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**T/F**: both sides are examined in a lateral nasal bone projection for comparison?
T
11
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PA/AP: Projections of the zygomatic arches are all done in --
AP
12
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Where is the CR directed in a SMV (zygomatic arches) projection?
MSP of the throat
13
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What reference line must be parallel to the IR in an SMV projection
IOML
14
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What is seen in a SMV projection?
Bilateral zygomatic arches with no superimposition

* looks like bucket handles
15
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In a tangential projection (zygomatic arches) where does the CR enter?
zygomatic arch
16
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Which reference line must be parallel to the IR in a tangential (zygomatic arch) projection?
IOML
17
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How is the head positioned for a tangential (zygomatic arch) projection?
Head is rotated 15 degrees towards affected side & Tilted 15 degrees away from the affected side.
18
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What does a tangential (zygomatic arch) projection demonstrate?
unilateral tangential image of the zygomatic arch
19
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\*\*In a modified townes projection (zygomatic arches) where is the CR directed to?
Glabella
20
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What projection of the zygomatic arches show a symmetric AP axial of both zygomatic arches
Modified townes (zygomatic arch)