Nasal Bone : Lateral View

Wednesday, March 11, 2015

Lateral Projection : Nasal Bone

Pathology Demonstrated:
  • Nasal bone fracture are shown.
  • Both side should be examined for comparison, with the side closest to the image receptor (IR) demonstrated.

Technical Factors:
  • Image Receptor size - 18 x 24 cm (8 x 10 inches)
  • Detail screen if conventional film-screen system is used in a non-grid table top technique.
  • 50 to 60 kV range.
  • Use small focal spot
  • Automatic exposure control ( AEC ) not recommended because of small exposure field.
  • mAs 3


Lateral Nasal Bonepan

Patient position when doing lateral nasal bone:
  • Remove all metallic or plastic objects from head and neck.
  • Patient position is prone or erect.

Part Position:
  • Rest lateral of head against the table / upright Bucky surface, with the side of interest closest to IR.
  • Position nasal bones to center of image receptor.
  • Adjust head into a true lateral position and oblique body as needed for patient's comfort (placing sponge block under chin if needed).
  • Align MSP parallel with the table / upright Bucky surface.
  • Align IPL perpendicular to the table or upright Bucky surface.
  • Position IOML perpendicular to front edge of image receptor.

Central Ray:
  • Align Central Ray perpendicular to Image Receptor (IR)
  • Center CR to 1/2 inch (1.25 cm) inferior to nasion.
  • Minimum SID is 40 inches (100 cm).

Collimation:



Left Lateral Bone








  • Collimate on all sides to within 2 inches (5 cm) of nasal bone.





  • Respiration:
    • Suspend respiration during exposure.
    Note: To obtain a sharply detailed image of the nasal bones, use a small focal spot close collimation, and detail screen with fim-screen imaging. In addition, with CR and DR digital imaging, accurate central ray centering tabletop masking and close collimation are essential because of the image reader function of the image receptor to scatter exposure.

    Radiographic Criteria:
    Structure Shown:
    • Nasal bones with soft tissue nasal structures, the frontonasal suture, and the anterior nasal spine.

    Position:



    Lateral Nasal Bone








  • Nasal bones are demonstrated without rotation.






  • Collimation and CR:
    • The nasal bones are included at the center of the image.
    • The nasal soft tissue, glabella, and acanthion are included within the collimated field.
    Exposure Criteria:
    • Contrast and density are sufficient to visualize nasal bone and soft tissue structures.
    • Sharp bony structures indicate no motion.


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