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LPO

Patient position

Begin erect, then recumbent on fluoro table.

Part position

Patient drinks barium; rotations 360° to coat stomach and duodenum.

Central ray

Perpendicular to L1 (stomach) on overhead images.

IR placement

II / flat panel.

Tech pearls

RAO opens the duodenal bulb in profile.
For double-contrast: gas crystals + thick barium, then rotate.

Right Lateral Series overview