Sella Turcica : Lateral Projection

Tuesday, December 3, 2013

Lateral View - Right or Left

Xray examination of the sella turcica may be demonstrated the pituitary adenoma if involvement of the sella turcica occurs.
Technical Factors:
  • IR size - 18 x 24 cm (8 x 10 inches), crosswise
  • Moving or stationary grid
  • 70 to 80 kV range
  • Small focal spot
  • mAs 10

sella turcica xray
Right Lateral Sella Tucica - Erect
Patient Position:
  • Remove all metallic or plastic objects from the patient's head.
  • Take radiograph with patient in an erect or recumbent semiprone position.

Part Position:
  • Place patient's head in a true lateral position; position patient's body oblique as needed for comfort.
  • Align interpupillary line perpendicular to table/Bucky surface.
  • Align midsagittal plane parallel to table/Bucky surface.
  • Place IOML perpendicular to front edge of IR.

Central Ray:
  • Align CR perpendicular to IR.
  • Center to a point 3/4 inch (2 cm) anterior and 3/4 inch (2cm) superior to the EAM.
  • Center image receptor to CR.
  • Minimum SID is 40 inches (100 cm)

  • Collimate to a field size of approximately 4 inches (10 cm) square.

  • Suspend respiration during exposure.

Note: To obtain a sharply detailed image of the sella turcica, use of a small focal spot and close collimation is essential.

Radiographic Criteria:

Structure Shown:
sella turcica radiograph
Lateral Sella Tucica

  • Sella turcica, anterior and posterior clinoid processes, dorsum sallae, and clivus are shown.

  • The sella turcica is visualized without rotation or tilt as indicated by the following.
  • The sella turcica and clivus are demonstrated in profile.
  • The anterior and posterior clinoids are superimposed.
  • Rotation can be differentiated from tilt by the following:
  • Rotation is evident by anterior and posterior separation of symmetric bilateral vertical structures such as the EAMs, mandibular rami, and clinoid processes.
  • Tilt is evident by superior and inferior separation of symmetric horizontal structures such as the orbital roofs (plates) and lesser wings of the sphenoid.

Collimation and CR:
  • Closely collimated image, with the sella turcica in the center.

Exposure Criteria:
  • Density and contrast are sufficient to clearly visualize sella turcica and pituitary fossa.
  • Sharp bony margins indicate no motion.

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