Saturday, August 17, 2013

0° CR

Pathology Demonstrated:
  • Skull fractures (medial and lateral displacement), neoplastic processes, and Paget's diseases are demonstrated.

Technical Factors:
  • IR size - 24 x 30 cm (10 x 12 inches), lenghtwise
  • Moving or stationary grid
  • 70 to 80 kV range
  • mAs 18

Patient Position:
pa skull xray
PA 0° CR
  • Remove all metallic or plastic objects from patient's head and neck. Exposure taken with patient in the erect or prone position.

Part Position:
  • Rest patient's nose and forehead against table/bucky surface.
  • Flex neck, aligning OML perpendicular to midline of table / Bucky to prevent head rotation and / or tilt (EAMs same distance from table/bucky surface).
  • Center IR to CR.

Central Ray:
  • CR is perpendicular to IR (parallel to OML) and is centered to exit at gabella.
  • Minimum SID is 40 inches (100 cm).

  • Collimate to outer margins of skull.

  • Suspend respiration during exposure.

Radiographic Criteria:

Structure Shown:
pa skull xray
PA 0° CR
  • Frontal bone, crista galli, internal auditory canals, frontal and anterior ethmoid sinuses, petrous ridges, greater and lesser wings of sphenoid, and dorsum sellae are shown.

  • No rotation is evident, as indicated by equal distance bilaterally from oblique orbital to lateral margin of skull.
  • Petrous ridges fill the orbits and superimpose the superior orbital region.
  • Posterior and anterior clinoids are visualized just superior to ethmoid sinuses.

Collimation and CR:
  • Entire skull is visualized on the image with the nasion in the center.
  • Collimation borders are visible to outer borders of skull.

Exposure Criteria:
  • Density and contrast are sufficient to visualized frontal bone and surrounding bony structures.
  • Sharp bony margins indicate no motion.

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