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The schematic drawing illustrates the ring-down artifacts when the US waves pass through the air bubbles (A). During imaging for inguinal hernia, the ring-down artifacts can be seen in the bowels (B). During intercostal block, the ring-down artifacts can be visualized deep to the pleura (C). White arrow: ring-down artifacts. RA: rectus abdominis. Black and blue arrow: the projected and reflected US beams.
