Where should the central ray be directed for a PA wrist X-ray?

For a PA (posteroanterior) wrist X-ray, directing the central ray just proximal to the styloid processes of the radius and ulna ensures proper visualization of the wrist joint and surrounding anatomical structures. Positioning the central ray correctly is crucial for obtaining accurate diagnostic images.

The styloid processes, which are bony projections at the distal ends of both the radius and ulna, serve as anatomical landmarks. Positioning the central ray just above them allows the X-ray to capture not only the carpal bones but also the articulation of the wrist, providing clear visibility of potential fractures, dislocations, or other pathologies.

This approach optimizes image quality as it centers the field of view on the wrist joint, ensuring that critical details necessary for evaluation and diagnosis are included in the radiograph.