Pelvis - Lateral

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Radiographic Positioning


Adult
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Name of projection Pelvis - Lateral
Area Covered Lateral view of lumbosacral junction, sacrum and coccyx and the superimposed pelvis and upper femora
Pathology shown
Radiographic AnatomyPelvis Radiographic Anatomy
IR Size & Orientation 35 x 43cm
Portrait
Film / Screen Combination Regular
(CR and DR as recommended by manufacturer)
Bucky / Grid Moving or Stationary Grid
FilterNo
Exposure 85 kVp
50 mAs
FFD / SID 100cm
Central Ray CR perpendicular to IR
CR directed to a point approximately 5cm above greater trochanter
Collimation Four sides of collimation
Shutter A - superior - to include L5 , Inferior to include upper femora
Shutter B - collimate to soft tissue margins
Markers Anterior and Distal
Marker orientation AP
Shielding Gonadal (check your department's policy guidelines)
RespirationSuspended
PositioningLateral recumbent positioning
  • patient in a lateral recumbent position on the table
  • patients head on pillow
  • extend thighs just enough to prevent femora from obscuring the shadow of the pubic arch
  • place support under the lumbar spine and adjust so that vertebral column is parrallel with table top
  • ensure pelvis in true lateral position with ASIS lying in the same plane
  • CR perpendicular to IR
  • CR directed to a point approximately 5cm above greater trochanter
Supine positioning
  • may be performed cross table using a horizontal ray with the patient supine (used when a suspected fracture dislocation of the acetabular rim and posterior dislocation of femoral head is suspected)
  • patient supine on the table
  • patients head on pillow
  • CR perpendicular to IR (horizontal ray)
  • CR directed to a point approximately 5cm above greater trochanter
Erect positioning
  • place patient in a lateral position against vertical bucky
  • evenly distribute weight on both feet
  • adjust position of body so the median sagittal plane is parrallel with the plane of the film
  • CR perpendicular to IR
  • CR directed to a point approximately 5cm above greater trochanter
Critique

Positioning
Area Covered

the following clearly demonstrated
  • entire pelvis and proximal femora
  • sacrum and coccyx
  • superimposed posterior margins of the ischium and ilium
  • superimposed femora
  • superimposed acetabular shadows
  • pubic arch unobscured by the femora
Collimation
Exposure
Special Notes