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skull · SMV
Skull Submentovertex (SMV)
Patient erect or supine, neck hyperextended, vertex against IR.
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AI Patient · KV Sir
How to perform this view
- 01
Seat patient with back to IR.
- 02
Hyperextend neck until vertex rests on IR.
- 03
IOML parallel to IR.
- 04
CR perpendicular to IOML, midway between angles of mandible.
- 05
Expose quickly - uncomfortable position.
Anatomical & patient position
Patient: Patient erect or supine, neck hyperextended, vertex against IR.
Part: IOML parallel to IR; MSP centred.
Central ray & centring point
Perpendicular to IOML, 4 cm inferior to mandibular symphysis.
Exposure factors
kVp
75-85 kVp
mAs
20-30 mAs
SID
100 cm
IR size
24 x 30 cm
Grid
Yes
Respiration
Suspended
Clinical indications
- Base of skull fractures
- Zygomatic arches
- Sphenoid sinuses
Contraindications & precautions
- Suspected unstable spinal injury - do NOT move neck/spine; use cross-table lateral first and keep collar - ABSOLUTE contraindication
- Elderly with cervical spondylosis
Structures shown & evaluation criteria
- Foramen ovale & spinosum
- Mandibular condyles anterior to petrous
- Zygomatic arches