The central ray (CR) for an anteroposterior (AP) supine, adult chest projection, should be centered:

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The central ray for an AP supine, adult chest projection should be centered 3 to 4 inches (8 to 10 cm) below the jugular notch. This is usually at the level of T7 or T8. This central ray placement allows for visualization of the lung fields as well as the heart and mediastinum. Choosing A or C would result in visualizing structures either too high or low, while choosing D would result in visualizing mainly abdominal structures.

The Central Ray (CR) for an Anteroposterior (AP) Supine, Adult