Skull - Townes
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Radiographic Positioning
Adult | Other related pages of interest |
Name of projection | Skull - Townes (also called Skull - AP Axial) |
Area Covered | Skull , foramen magnum |
Pathology shown | Fractures and pathologies of the skull |
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 | 80 kVp 20 mAs |
FFD / SID | 100 cm |
Central Ray | Directed to 6 cm superior to the glabella (this is typically the hairline) CR 30° caudal (see note below) |
Collimation | Outer skin margins of the skull |
Markers | Superior and Lateral Marker orientation AP |
Shielding | Gonadal (check your department's policy guidelines) |
Respiration | Suspended |
Positioning |
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Critique | Positioning
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Special Notes | Effect of the central ray angle being less than 30 degrees to the radiographic baseline (OML) The dorsum sellae will project higher. This means that it will project above the foramen magnum, rather than in it. |