What angle and direction is the CR directed when performing an AP axial projection of the cervical spine?

The correct answer involves directing the central ray (CR) at a 15° cephalad angle when performing an anteroposterior (AP) axial projection of the cervical spine. This particular angle is essential for adequately visualizing the intervertebral foramina and the lower cervical vertebrae by reducing the superimposition of the vertebrae and improving the overall diagnostic quality of the image.

Using a cephalad angle of 15° helps to align the x-ray beam with the anatomy of the cervical spine, allowing for a clearer view of the structures being examined. This position enhances the visualization of the cervical spine curvature and provides a better perspective for assessing possible pathologies.

Other options suggest different angles or directions, which may not achieve the same diagnostic effectiveness for the AP axial view. Proper angling is critical in radiographic techniques to ensure that the resulting images provide accurate and useful information for diagnosis.