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Table 1 Nomenclature for parameters measured on CT reconstruction images

From: Morphometric evaluation of subaxial cervical spine using multi-detector computerized tomography (MD-CT) scan: the consideration for cervical pedicle screws fixation

Measurement Abbreviation Descriptions
Outer pedicle width OPW Outer mediolateral diameter of the pedicle isthmus measured from Axial CT image
Inner pedicle width IPW Inner mediolateral diameter of the pedicle isthmus (the width of the cancellous core) measured from Axial CT image
Outer pedicle height OPH Outer superoinferior diameter of the pedicle isthmus measured from Axial reconstruction image perpendicular to the longitudinal pedicle axis
Inner pedicle height IPH Inner superoinferior diameter of the pedicle isthmus (cancellous core diameter) measured from Axial reconstruction image perpendicular to the longitudinal pedicle axis
Pedicle transverse angle PTA The angle between the pedicle axis projection and the anatomical sagittal plane measured from Axial CT image
Pedicle sagittal angle PSA The angle between the inferior endplate and longitudinal pedicle axis measured from Axial reconstruction image along the plane of longitudinal pedicle axis