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The illustration of standard CT coordinate system.
The coordinate system of CT scan takes the bed plane as coronal plane C; the sagittal plane is plane S perpendicular to the coronal plane through the transverse axis of the CT machine; and the plane pairwise perpendicular to both the coronal plane and the sagittal plane is transverse plane A. The intersecting lines of the three planes form the x, y, and z axes with directions.
