The central ray for a PA coccyx projection is projected where?

In a PA (posteroanterior) coccyx projection, the central ray is targeted just below the level of the sacrococcygeal joint. This positioning is crucial for ensuring that the coccyx is adequately visualized without superimposition from surrounding structures. By centering the x-ray beam in this manner, radiologists can obtain a clear view of the coccyx while minimizing the dose to the surrounding tissues.

Positioning the central ray just below the sacrococcygeal joint effectively aligns the beam with the anatomical structure of the coccyx. This area is where the coccyx meets the sacrum, and by placing the ray just below this joint, it allows for sufficient radiographic detail of the coccyx itself. Additionally, this method helps achieve the correct angulation, which is typically around 10 degrees caudad in a PA view to ensure that the image depicts the coccyx in its true anatomical position.