Skull (AP view)

Andrew Murphy and Dr Matt A. Morgan et al.

The skull AP view is a nonangled AP radiograph of the skull. This view provides an overview of the entire skull rather than attempting to highlight any one region.

  • the back of patient's head is placed against the image detector
  • anterior-posterior projection
  • centring point
    • the central ray is centred at the nasion
  • collimation
    • laterally to include soft tissue
    • superiorly soft tissue
  • orientation
    • portrait 
  • detector size
    • 24 cm x 30 cm
  • exposure
    • 75 kVp
    • 8-10 mAs
  • SID
    • 100 cm 
  • grid
    • yes
  • ensure the image is symmetrical and free from any rotation
  • asses the orbital margins an ensure they are similar in appearance 
  • the petrous ridge will overlap the lower 1/3 of the orbits
  • make sure that any removable artefacts such as earrings, glasses or metal dentures are removed to avoid obscuring the anatomy of interest
  • may be necessary in patients who cannot be easily or quickly rotated into the skull PA view

  • overlap of facial bone structures makes it harder to evaluate the sinuses than with an angled view (e.g. Caldwell view)
  • the AP view increases the radiation dose to the eyes compared with the PA view
  • increased magnification of the facial bones compared with the PA view 
Radiographic views
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Article information

rID: 37219
Section: Radiography
Synonyms or Alternate Spellings:

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Cases and figures

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    Figure 1
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    Case 1: with ventricular shunt
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    Figure 2: skull positioning lines
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    Figure 3: cranial landmarks
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