What degree of rotation is required for a right posterior oblique (RPO) cervical spine projection?

For a right posterior oblique (RPO) cervical spine projection, the required degree of rotation is 45 degrees. This positioning enables the proper visualization of the cervical vertebrae and intervertebral foramen. In an RPO position, the patient's body is rotated towards the right side, which aligns the cervical spine in such a way that the right structures can be viewed clearly on the X-ray. This rotation is critical because it opens up the spaces between the vertebrae on the side being imaged, specifically allowing for better access to the right intervertebral foramen.

In contrast, other degree options such as 30 degrees, 60 degrees, and 75 degrees do not achieve the appropriate angle necessary for clear imaging of the cervical structures, which can result in overlapping of anatomical features or inadequate visualization of the area of interest.