| Group | Procedure | Rating | Comments | RRL* |
| | X-ray cervical spine lateral only | 1 | | Min |
| | X-ray cervical spine AP lateral open mouth | 1 | | Low |
| | X-ray cervical spine AP lateral open mouth obliques | 1 | | Low |
| | X-ray cervical spine AP lateral open mouth obliques flexion/extension | 1 | | Low |
| | CT cervical spine with sagittal and coronal reformat | 1 | | Low |
| | CT myelography cervical spine | 1 | | Med |
| | CTA head and neck | 1 | | Low |
| | MRI cervical spine | 1 | | None |
| | MRA neck | 1 | | None |
| | INV arteriography head and neck | 1 | | IP |