Skull (Towne view)

The Towne view is an angled AP radiograph of the skull, used to evaluate for fractures of the skull and neoplastic changes. The projection is used to visualize the petrous part of the pyramids, the dorsum sellae and the posterior clinoid processes, which are visible in the shadow of the foramen magnum.

  • nuchal ridge is placed against the image detector
  • the infraorbitomeatal line perpendicular to the image receptor
  • anteroposterior axial projection
  • centring point
    • the beam travels 30 degrees caudad to the orbitomeatal line
  • collimation
    • superior to include skin margins
    • inferior to include base of skull
    • lateral to the skin margins 
  • orientation  
    • portrait
  • detector size
    • 24 cm x 30 cm
  • exposure
    • 60-70 kVp
    • 10-20 mAs
  • SID
    • 100 cm
  • grid
    • no
  • dorsum sella overlies the foramen magnum
  • petrous ridges are symmetrical 
  • if the dorsum sella projects above the foramen magnum it requires an increase in angle
  • if the anterior arch of C1 is laying in the foramen magnum, less angle is required 
  • occipital bone and posterior fossa space better evaluated than with a non angulated AP view, which would have more skull base and facial bone overlap
  • better than a conventional AP view for evaluating an occipital plagiocephaly involving the lambdoid suture 
  • may be a useful additional view for evaluating skull fractures 1
Radiographic views
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Article information

rID: 37239
Section: Radiography
Synonyms or Alternate Spellings:
  • Grashey skull view
  • Skull AP axial view
  • Towne view
  • Chamberlain-Towne view
  • Chamberlain-Towne projection

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Cases and figures

  • Figure 1: skull positioning lines
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  • Case 1: Towne view (skull AP axial view)
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  • Figure 2: cranial landmarks
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  • Figure 3: Towne view (skull AP axial view)
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