ABDOMINAL X-RAY - POSTEROANTERIOR (PA) | PRONE POSITION

Tuesday, December 6, 2011

PA - PRONE POSITION: ABDOMEN 


Pathology Demonstrated:

  • Pathology of abdomen, including bowel obstruction, neoplasms, calcifications, ascites, and scout image for contrast medium studies of abdomen.

Note:

  • This projection is less desirable than the AP if the kidneys are of primary interest because of the increased object image receptor distence (OID).

Technical Factor:

  • IR size - 35 x 43 cm (14 x 17 inches), lengthwise
  • Moving or stationary grid
  • 70 - 80 kV range

Shielding:

  • Use gonadal shields on male (also on females of reproductive age, only if such shielding does not obscure essential anatomy as determined by a physician).

Patient Position:

  • Prone with midsagital plane of body centered to midline of table and/ or IR
  • Legs extended with support under ankles
  • Arms up beside head; clean pillow provided

Part Position:

  • No rotation of pelvis or shoulders and thorax
  • Center of IR to illiac crest

Central Ray

  • CR perpendicular to and directed to center of IR (to level of illiac crest)
  • Minimum SID of 40 inches (100cm)

Collimation:

  • Collimate closely on all sides to skin margins and on top and bottom to IR borders.

Respiration:

  • Make exposure at end of expiration.

Note:
  • Tall, asthenic-type patients may require two images placed lengthwise; broad hypersthenic type may also require two images placed crosswise.

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