Abdomen (AP supine view)

AP supine radiograph can be performed as a standalone projection or as part of an acute abdominal series, depending on the clinical question posed, local protocol and the availability of other imaging modalities.

  • the patient is supine, lying on their back, 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
  • AP 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
  • lateral abdominal wall should be included
  • inferior pubic rami should be included inferiorly
  • if possible, the diaphragm should be included superiorly
  • abdomen should be free from rotation with symmetry of the:
  • no blurring of the bowel gas due to respiratory motion

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


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Article Information

rID: 38090
Section: Radiography
Synonyms or Alternate Spellings:
  • Supine abdominal radiograph
  • Abdominal x-ray (AP supine view)

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    Figure 1: AP supine view
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