Exams
Skull / Facial

Towne's (AP Axial)

1 default · 0 custom

Quick technique

kVp
75–85
mAs
25–40
SID
40 in
Grid
Yes
Detector
24x30 cm.
Breath
Suspend respiration.

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Placeholder
Patient position
Supine or erect, back against IR.
Part position
OML perpendicular to IR; chin tucked.
Central ray
30° caudal to OML (37° to IOML), enters 2.5 in above glabella.
IR placement
24x30 cm.

TechniqueDefault

kVp
75–85
mAs
25–40
SID
40 in
Grid
Yes
Breath
Suspend respiration.
Detector
24x30 cm.

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Anatomy coverage

Occipital bone, foramen magnum with dorsum sellae inside, posterior parietals.

Tech pearls

  • Modified Towne's for mandibular condyles uses 35° caudal.
  • Verify chin is tucked — line OML perpendicular to detector.

Image evaluation

  • Dorsum sellae within foramen magnum
  • Symmetric petrous pyramids

Common mistakes

  • Wrong angle to OML/IOML
  • Chin not tucked enough
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Anatomy overview

Occipital boneForamen magnumDorsum sellaePetrous pyramids
Open region anatomy atlas

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