In an anteroposterior (AP) axial projection for the cervical spine, what is the correct angulation for the x-ray tube?

In an anteroposterior (AP) axial projection of the cervical spine, a cephalic angulation of 15 to 20 degrees is necessary to effectively visualize the intervertebral spaces between the cervical vertebrae and reduce the superimposition of the adjacent structures. This specific angulation helps align the x-ray beam with the anatomical structures of the cervical region, allowing for clearer images of the cervical discs and preventing obscuration by the mandible and other surrounding tissues.

The precise angulation is particularly important in cervical spine imaging due to the curved nature of the cervical vertebrae and the need to minimize distortion while maximizing detail in the x-ray image. By directing the x-ray beam slightly upward (cephalically) at the correct angle, the radiographer enhances the diagnostic quality of the resultant images, facilitating better assessment by healthcare professionals.