9/23- Skull Positionin; Lateral, PA and AP/PA Axial

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Last updated 12:48 AM on 9/24/26
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25 Terms

1
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What SID is typically used for a lateral skull projection?
40 inches
2
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How should the MSP be positioned for a true lateral skull projection?
Parallel to the IR
3
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Which positioning line should be perpendicular to the IR to prevent head tilt on a lateral skull projection?
IPL
4
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How should the IOML be positioned for a lateral skull projection?
Perpendicular to the front edge of the IR
5
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Where should the CR be centered for a lateral skull projection?
Approximately 2 inches superior to the EAM
6
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What finding helps confirm a true lateral skull position?
The sella turcica should be seen in profile with paired cranial structures closely superimposed
7
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What SID is typically used for a routine PA skull projection?
40 inches
8
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How is the patient’s head positioned for a routine PA skull projection?
Nose and forehead against the IR with the MSP perpendicular to the IR
9
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Where does the CR exit for a routine PA skull projection?
Nasion
10
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What should the petrous ridges look like on a properly positioned PA skull image?
They should fill or project high within the orbits
11
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What SID is typically used for an AP axial Towne projection of the skull?
40 inches
12
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What CR angle is used for an AP axial Towne when the OML is perpendicular to the IR?
30° caudad to the OML
13
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A patient cannot flex the neck enough to place the OML perpendicular to the IR for a Towne projection. Which positioning line and CR angle should be used instead?
IOML perpendicular to the IR with a 37° caudad CR
14
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Where does the CR enter for an AP axial Towne projection?
Approximately 2.5 inches superior to the glabella
15
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Which structures should be projected within the foramen magnum on a properly positioned AP axial Towne image?
Dorsum sellae and posterior clinoid processes
16
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What evaluation finding indicates proper CR angulation on an AP axial Towne skull image?
The dorsum sellae and posterior clinoid processes are projected within the foramen magnum
17
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What SID is typically used for a PA axial Caldwell skull projection?
40 inches
18
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What CR angle is used for a PA axial Caldwell skull projection?
15° caudad
19
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How should the head be positioned for a PA axial Caldwell skull projection?
Nose and forehead against the IR with the MSP perpendicular to the IR
20
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Where does the CR exit for a PA axial Caldwell skull projection?
Nasion
21
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Where should the petrous pyramids be projected on a properly positioned PA axial Caldwell skull image?
In the lower one-third of the orbits
22
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A skull image demonstrates the petrous pyramids in the lower one-third of the orbits. Which projection was most likely performed?
PA axial Caldwell
23
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A skull image demonstrates the dorsum sellae and posterior clinoid processes within the foramen magnum. Which projection was most likely performed?
AP axial Towne
24
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A frontal skull image shows the petrous ridges filling most of the orbital region with no CR angulation. Which projection was most likely performed?
Routine PA skull
25
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Which skull projection uses the greater CR angulation, Caldwell or Towne?
Towne; 30° caudad compared with 15° caudad for Caldwell