Sagittal MDCT image of the craniocervical junction demonstrates the AOI, which is calculated by drawing a line perpendicular to the articular surfaces.

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Presentation transcript:

Sagittal MDCT image of the craniocervical junction demonstrates the AOI, which is calculated by drawing a line perpendicular to the articular surfaces of the occipital condyle and the lateral mass of C1. Sagittal MDCT image of the craniocervical junction demonstrates the AOI, which is calculated by drawing a line perpendicular to the articular surfaces of the occipital condyle and the lateral mass of C1. This line is drawn at the center of the articulation by correlating the sagittal and coronal images. C.A. Rojas et al. AJNR Am J Neuroradiol 2007;28:1819-1823 ©2007 by American Society of Neuroradiology