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Figure 1

From: Supratentorial Cerebral Arterial Territories for Computed Tomograms: A Mapping Study in 1160 Large Artery Infarcts

Figure 1

Different slice angles for axial MR vs. CT images. (A) The anterior-posterior commissure line (ACPCL) and orbitomeatal line (OML) for the image slicing of respectively MRI and CT are not parallel. Because of the pitch angle difference (average 9°) between the imaging reference lines, the anterior and posterior portions of the axial CT image is respectively about ~10 mm lower and higher in the z-axis, with the central portion overlapping around the rotation point, centered on the MR slice of interest (asterisks). Here, 10-mm difference corresponds to about 2-slice difference, because the slice thicknesses of MRI and CT are respectively 6 mm and 5 mm. (B) Anatomical matching of the anterior portions in the MR and CT images (yellow arrows in the upper panel figures) causes a mismatching of the posterior portions (red arrows in the upper panel figures), and vice versa (yellow and red arrows in the lower panel figures).

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