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spine · AP (Open Mouth)
Cervical Spine Odontoid (Open Mouth)
Patient supine or erect, back to IR.
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AI Patient · KV Sir
How to perform this view
- 01
Position MSP centred, no rotation.
- 02
Ask patient to open mouth as wide as possible.
- 03
Align lower margin of upper incisors with mastoid tip perpendicular.
- 04
Ask patient to softly say 'ahh' to flatten tongue.
- 05
CR through centre of open mouth.
- 06
Expose quickly.
Anatomical & patient position
Patient: Patient supine or erect, back to IR.
Part: Mouth wide open; lower edge of upper incisors and mastoid tips aligned perpendicular.
Central ray & centring point
Perpendicular through centre of open mouth.
Exposure factors
kVp
70-80 kVp
mAs
10-15 mAs
SID
100 cm
IR size
18 x 24 cm
Grid
Yes
Respiration
Suspended; phonate 'ahh'
Clinical indications
- Dens (odontoid) fracture
- Jefferson fracture of C1
- Atlanto-axial alignment
Contraindications & precautions
- Suspected unstable spinal injury - do NOT move neck/spine; use cross-table lateral first and keep collar - do not tilt head until lateral cleared
- Pregnancy (relative) - confirm LMP / 10-day rule, justify exposure and shield where possible
Structures shown & evaluation criteria
- Dens and body of C2
- Lateral masses of C1
- Atlanto-axial joints