Cram sheet
Procedures → Thorax and Abdomen
The acute abdomen series reuses the exact same physics as the pneumothorax decubitus rule from the chest module — free air rises, and that single fact drives most of the positioning logic here. The other half of this module is the contrast-agent decision, which is a patient-safety question before it is an imaging question: pick barium when it could leak into the peritoneum and you cause peritonitis.
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