How much and in which direction is the CR angled for an AP axial oblique projection of the cervical spine?

For an AP axial oblique projection of the cervical spine, the central ray (CR) is angled 15 degrees cephalad. This specific angulation is important because it helps to open up the intervertebral foramina, allowing for better visualization of the cervical spine structures.

In the AP axial view, the cephalad angulation directs the x-ray beam towards the cervical vertebrae while compensating for the natural lordotic curve of the cervical spine. This technique enhances the diagnostic quality of the images by ensuring that the intervertebral foramina are adequately projected and can be evaluated for any pathological conditions or anomalies.

Correctly angling the CR is crucial in obtaining a clear image that fulfills the diagnostic purpose of the radiographic examination.