Question

to ensure that an anteroposterior (ap) mobile chest radiograph is free of rotation, what structures should appear symmetrical?
ribs and clavicles
scapulae and humeri
sternum and xiphoid process
lung apices and costophrenic angles

Explanation:

In an AP mobile chest radiograph, the ribs and clavicles should appear symmetrical to ensure the image is free of rotation. The scapulae and humeri may not always be in perfect symmetry in a mobile chest - view, the sternum and xiphoid process are mid - line structures and not the best indicators of rotation, and the lung apices and costophrenic angles are more related to lung and pleural space assessment rather than rotation assessment.

Answer:

Ribs and clavicles