Image Type Translation on Sagittal Reconstruction Atlantodental Interval (ADI) Basion–Axial Interval (BAI) X-Ray CT Scan MRI Scan Cervical Spine Occipital Condyle–C1 Interval (CCI) Power’s Ratio Facet Joint Overlap (Percent Overlap Method) Basion–Dens Interval (BDI) Angulation between Segments Clivo-Axial Angle Sagittal Vertical Axis (SVA) PADI Grabb-Oakes Measurement (pB - C2 line) Facet Joint Step-Off/Dislocation
