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Radiographic Positioning

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Name of projection AP Projection Below Diaphragm Ribs
Area Covered Ribs 8 through 12 should be visualized
Pathology shown Pathology of the ribs including fracture and neoplastic processes, is demonstrated
Radiographic Anatomy
IR Size & Orientation 35 by 43 cm (14 by 17 inches) Lengthwise or Crosswise
Film / Screen Combination
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or stationary grid
Exposure 75 to 80 kV
FFD / SID 40 inches (100 cm)
Central Ray perpendicular, centeres to midway between xiphoid and lower rib cage
Collimation collimate to outer margins of thorax
Shielding (check your department's policy guidelines)
Respiration Suspend respiration on expiration
  • Supine preferred

  • Rotation of the thorax should not be evident
Area Covered
  • Ribs 8 through 12
  • Center Collimation field appropriately, including ribs 8 through 12.
  • Optimal contrast and density to visualize ribs through lungs and heart shadow or through the dense abdominal organs if below diaphragm.
  • No motion, as demonstrated by sharp bony markings.
Special Notes If doing a bilateral rib examination, place IR crosswise for large patients for both above and below diapragm ribs to ensure that lateral rib margins are not cut off. This compensates for magnification caused by 40 inches (100 cm ) of SID.

Latest page update: made by AndyC , Feb 28 2011, 6:47 PM EST (about this update About This Update AndyC Moved from: atlas - AndyC

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Keyword tags: AP BELOW DIAPHRAGM Ribs
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