Abdomen (PA prone view)

PA prone radiograph is rarely performed, often utilized when a patient is unable to lay supine. The projection is adequate for the examination of the abdominal cavities, however, not as practical for the renal structures due to magnification.

Patient position

• the patient is prone, either on the x-ray table (preferred) or on a trolley
• patients should be changed into a hospital gown, with radiopaque items (e.g. belts, zippers) removed
• the patient should be free from rotation; both shoulders and hips equidistant from the table/trolley
• the x-ray is taken in full inspiration

Technical factors

• PA projection
•  centring point
  • the midsagittal place (equidistant from each ASIS) at the level of the iliac crest
• collimation
  • laterally to the lateral abdominal wall
  • superior to the diaphragm
  • inferior to the inferior pubic rami
• orientation
  • portrait
• detector size
  • 35 cm x 43 cm
• exposure
  • 70-80 kVp
  • 30-120 mAs; AEC should be used if available
• SID
  • 100 cm
• grid
  • yes

Image technical evaluation

• lateral abdominal wall should be included
• inferior pubic rami should be included inferiorly
• if possible, the diaphragm should be included superiorly
• the abdomen should be free from rotation with a symmetry of the:
  • ribs (superior)
  • iliac crests (middle)
  • obturator foramen (inferior)
• no blurring of the bowel gas due to respiratory motion

Practical points

For larger patients, it may be necessary to perform two x-rays using a landscape orientation of the detector to include the entire abdomen.

Exposure will need to be adjusted according to an imaging system (CR or DR) and patient size. Where possible mAs should be manipulated to ensure adequate image density and appropriate image contrast.

Ensure the patient has adequate head space to breath and hear instructions.