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How should the arms be positioned for an erect lateral projection of the sternum?

  1. Held above the head

  2. Relaxed at the sides

  3. Drawn forward in front of the chest

  4. Drawn back behind the back

The correct answer is: Drawn back behind the back

For an erect lateral projection of the sternum, positioning the arms drawn back behind the back serves several important purposes. This positioning helps to clearly visualize the sternum without superimposition from the arms. By moving the arms out of the primary imaging area, it reduces the likelihood of artifacts that could obscure the sternum. This positioning also allows for optimal lung visualization, providing a clearer contrast between the sternum and surrounding structures. Moreover, having the arms drawn back can help to maintain patient stability during the procedure and ensure that the torso remains in the correct position for accurate imaging. This technique is essential for achieving high-quality radiographs that meet diagnostic standards.