Psoas major muscles, kidneys, inferior ribs, and lumbar transverse processes are demonstrated on AP abdominal projections.
The anteroposterior (AP) radiograph the patient in a supine position is the basis of the majority of plain-film examinations of the abdomen.
However, an upright-position film could also be helpful in patients with suspected bowel obstruction, also as to assess the air-fluid levels in the distended bowel.
This information also can be obtained on a film of the abdomen taken with the patient in the lateral decubitus position.
An AP supine projection is usually called a flat plate or KUB (because it includes the kidneys, ureter, and bladder)
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