A neck X-ray is a safe and painless test that uses a small amount of radiation to make images of the soft tissues in the neck. During the examination, an X-ray machine sends a beam of radiation through the neck, and an image is recorded on a computer or special film. The AP view is one of 3 primary views used to evaluate for the presence of a cervical fracture or subluxation after a traumatic injury involving the head and/or neck. It may also be performed to diagnose the cause of back or neck pain.