Where should the central ray be directed for an AP elbow radiograph?

The central ray should be directed through the elbow joint for an anteroposterior (AP) elbow radiograph. This positioning is critical because it ensures that the image captures the full anatomy of the elbow joint, including the distal humerus, proximal radius, and proximal ulna. A precise alignment of the central ray at this location minimizes distortion, enhances visualization of the joint space, and allows for accurate evaluation of any potential fractures, dislocations, or other pathologies.

Directing the central ray through the elbow joint helps achieve a clear and focused representation of this key anatomical area, which is essential for diagnostic purposes. The correct alignment ensures that the radiograph is not only of high quality but also useful in guiding medical decisions about treatment or further imaging.