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 ensures that the heart, lungs, and mediastinum are included in the image while minimizing magnification of the heart. Centering at T4 or the vertebra prominens would result in an incomplete image of the lungs and mediastinum, while centering at the xiphoid process would cause excessive magnification of the heart.

The Central Ray (CR)for an Anteroposterior (AP)supine,adult Chest Projection,should Be