Sinuses - SMV (Submentovertical)

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Radiographic Positioning

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Name of projection Sinuses - SMV (Submentovertical)This is a featured page
Area Covered Sphenoid sinuses, ethmoid sinuses, nasal fossae and maxillary sinuses
Pathology shown Inflammatory conditions ie: sinusitis, secondary osteomyelitis and sinus polyps
Radiographic Anatomy Sinuses Radiographic Anatomy
IR Size & Orientation 18 x 24cm
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 100cm
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 Collimate closely to area of sinus cavaties
Markers Superior and Lateral
Marker orientation AP
Shielding Gonadal (check your department's policy guidelines)
Respiration Suspended
  • 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.

Area Covered
Special Notes