When positioning for an AP open-mouth projection of the cervical spine, which three statements are true?

The correct choice highlights that the occlusal plane is perpendicular to the image receptor (IR) when performing an anteroposterior (AP) open-mouth projection of the cervical spine. This positioning is crucial for obtaining a clear, well-aligned image of the upper cervical spine, specifically the first and second cervical vertebrae (C1 and C2), along with the atlantoaxial joint. When the occlusal plane is aligned in this manner, it ensures that the anatomy of interest is accurately captured without distortion, providing a better diagnostic view.

Understanding the significance of this positioning is essential in radiographic technique, as the AP open-mouth view targets the critical Atlantoaxial joint region. This allows for the assessment of potential injuries or abnormalities in this area, which is particularly susceptible to trauma.

The other statements do not accurately reflect the correct positioning requirements or outcomes associated with this specific projection. While the image does demonstrate the atlantoaxial joint, and the mid-sagittal plane (MSP) must be oriented appropriately, the assertion regarding the occlusal plane is the primary focus in establishing the correct positioning for this projection.