Lumbar Spine - PA/AP
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Radiographic Positioning
Adult | Other related pages of interest |
Name of projection | Lumbar Spine - AP / PA |
Area Covered | T11 to distal sacrum - including lumbar vertebral bodies, intervertebral joints, spinous and transverse processes, SI joints and sacrum |
Pathology shown | Pathology of lumbar vertebrae - fractures, scoliosis and neoplastic processes |
Radiographic Anatomy | Lumbar Spine Radiographic Anatomy |
IR Size & Orientation | 35 x 43 cm larger patient 30 x 35 cm smaller patient Portrait |
Film / Screen Combination | Regular (CR and DR as recommended by manufacturer) |
Bucky / Grid | Moving or Stationary Grid |
Filter | No |
Exposure | 75 kVp x 35 mAs or breathing technqiue 75kVp x 35 mA with 1.6 seconds exposure time see - lumbar AP breathing technique |
FFD / SID | 100 cm |
Central Ray | CR perpendicular to IR Larger patient - centre to iliac crest (L4-5) Smaller patient - centre to L3 (lower costal margin) (4cm above iliac crest) |
Collimation | Four sides of collimation Collimate near IR margins |
Markers | Lateral Marker orientation AP |
Shielding | Gonadal (check your department's policy guidelines) |
Respiration | Suspend respiration on expiration or use breathing technique |
Positioning |
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Critique | Positioning see imaging vertebral body wedge fractures |
Special Notes |