Sinuses - SMV (Submentovertical)

Radiographic Positioning

Adult

Other related pages of interest Applied Radiography Radiographic Anatomy Radiographic Protocols

Name of projection	Sinuses - SMV (Submentovertical)
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 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	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
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 PACEMAN	Positioning Area Covered Collimation Exposure
Special Notes