Skull - SMV (Submentovertex) (Basal)This is a featured page

Radiographic Positioning


Adult
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Name of projection Skull - SMV (Submentovertex) (also called Basal)
Area Covered This view looks at the base of the skull, including structures such as the foramen ovale, foramen spinosum, and sphenoid sinuses
Pathology shown Some pathologies of the base of the skull and sphenoid sinuses
Radiographic Anatomy Skull Radiographic Anatomy
IR Size & Orientation 24 x 30 cm
Portrait
Film / Screen Combination Regular
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or Stationary Grid
Filter No
Exposure 70 kVp
20 mAs
FFD / SID 100 cm
Central Ray Directed to the midsaggital plane at the point midway between the angles of mandible, which is also approximately the point midway between the external auditory meatus (EAMs).
Perpendicular to the IR/bucky
Collimation Laterally, to the soft tissue margins of the skull, including the mandible and occiput
Markers Superior and Lateral
Marker orientation AP
Shielding Gonadal (check your department's policy guidelines)
Respiration Suspended
Positioning
  • The aim is to get the IOML (Infraorbitomeatal Line) parallel to the IR and bucky. The method used to achieve this will depend on the presentation of the patient.
  • The following description is for patients who are able to tip their head back, hyperextending their neck, and are able to sit.
    • The patient sits in an AP position in front of the upright bucky
    • The chin is raised and the head tipped back until the IOML is parallel to the bucky and the vertex of the skull is centred and resting against the bucky.
    • If the patient is able to achieve this position then the central ray is perpendicular to both the bucky and the IOML.
    • If the patient is unable to tip their head back far enough, then angle the central ray so that it is perpendicular to the IOML.
    • Ensure the midsagittal plane is perpendicular to the bucky.
Critique

 Positioning
  • No rotation is evidenced by
    • The lateral borders of the foramen magnum are equidistant from the lateral borders of the skull.
  • No tilt is evidenced by
    • The vomer and the bony nasal septum are aligned with the long axis of the film.
  • The central ray is at 90 degrees to the IOML, evidenced by
    • The mandibular mentum superimposes the outer border of the frontal bone.
Area Covered
  • Occiput, foramen magnum, sphenoid sinuses, foramen ovale, foramen spinosum, mandible,
Collimation
  • Centre: Midway between the EAMs
  • Shutter A: Open to include the soft tissue and lateral borders of the skull
  • Shutter B: Open to include the mandible superiorly and the occiput of the skull inferiorly
Exposure
  • Assess for adequate penetration of the thickest part of the skull
  • Bony trabecular patterns and cortical outlines are sharply defined
  • Soft tissues are visualised
Special Notes



AndyC
AndyC 		Latest page update: made by AndyC , Jun 16 2011, 3:02 PM EDT (about this update About This Update AndyC Edited by AndyC

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Keyword tags: Schueller skull positioning SMV submentovertex
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mustafaezaldeenawad submentovertix 0 Oct 16 2011, 6:40 AM EDT by mustafaezaldeenawad
Thread started: Oct 16 2011, 6:40 AM EDT  Watch
the smv view is very hard position to proceed but it very helpfull in detecting the fractures of the base of the skull so it's very important for this view to be achived as basic view of the skull.
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Keyword tags: Schueller skull positioning SMV submentovertex
rasningo It wasn't easy until....! 0 Jan 25 2011, 12:47 AM EST by rasningo
Thread started: Jan 25 2011, 12:47 AM EST  Watch
when my lecturer taught it wasn't easy but thanks to wikiradiography.....i now understand...!
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Keyword tags: Schueller skull positioning SMV submentovertex
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