Chest - Ventral Decubitus

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Radiographic Positioning

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Name of projection Chest - Ventral Decubitus
Area Covered Lung fields, apices, costophrenic angles
Pathology shownPathologies involving the lung fields, changes in fluid position from PA/AP view and reveals any previously obscured pulmonary areas
Radiographic AnatomyChest 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 110 kVp
8 mAs
FFD / SID 180cm
Central Ray Directed to the mid coronal plane at the level of T7
Perpendicular to the IR
Collimation Centre: The mid coronal plane at the level of T7
Shutter A: Open to include the skin margins anteriorly and posteriorly
Shutter B: Open to include lung apices superiorly (this is at the C7 level) and to include the diaphragm inferiorly
Markers Superior and Anterior
Marker orientation AP
Shielding Gonadal (check your department's policy guidelines)
Respiration On suspended deep inspiration
  • Patient prone on the X-ray table
  • Raise the thorax off the table 5 to 8cm using a firm mattress (to prevent cutting off essential anatomy)
  • Keep patient in position for 5 minutes prior to exposure to allow air to rise and fluid to settle
  • Adjust body into true prone position and extend arms above the head
  • Place affected side next to upright bucky / vertically placed IR
  • CR directed to the mid coronal plane at the level of T7, perpendicular to the IR

Area Covered
Special Notes