Thoracic - Oblique

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Radiographic Positioning

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Name of projection Thoracic - Oblique
Area Covered C7 to L1, zygapophyseal joints of the thoracic spine
Pathology shownPathology involving the zygapophyseal joints of the thoracic spine, (both right and left obliques are taken for comparison)
Radiographic AnatomyThoracic Spine Radiographic Anatomy
IR Size & Orientation 35 x 43 cm
Film / Screen Combination Regular
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or Stationary Grid
Exposure 66kVp
FFD / SID 100 cm
Central Ray CR perpendicular to IR
CR centred to T7 (which corresponds to the level of the inferior border of the scapula)
Collimation Four sides of collimation to area of interest
Markers Superior and Anterior
Marker orientation AP
Mark the side that is being demonstrated - anterior oblique demonstrates the zygapophyseal joint closest to IR, posterior oblique demonstrates the joints farther from the IR
Shielding Gonadal (check your department's policy guidelines)
RespirationSuspended respiration on expiration.
  • Align midaxillary plane to CR and midline of table or IR
  • Rotate the body 20° from true lateral to create a 70° oblique from plane of the bucky
  • Ensure equal rotation of shoulders and pelvis
Posterior Obliques (recumbent)
  • LPO or RPO, arm nearest the table should be up and foward, arm nearest the tune should be down and posterior
Anterior Obliques (recumbent)
  • LAO or RAO, arm nearest the table should be down and posterior , arm nearest the tube should be up and foward
Erect Anterior obliques
  • Distribute weight equally on both feet
  • rotate body, shoulders and pelvis 20° from lateral
  • flex ellbow and place arm closest to IR on hip
  • raise opposite arm and rest on top of head

Area Covered
Special Notes