A central ray trajectory across a plane that is inclined to the transverse plane or coronal plane corresponds to an oblique projection.
Preoperative oblique-projection plain radiograph films are beneficial for evaluation of the pedicle size. The contralateral pedicle is shown as an oval projected onto the vertebral body in an oblique projection, revealing its outer and inner diameters. Axonometric projections are better for elliptical forms than oblique position, which is better for "mechanical" viewing but lacks perspective forshortening. Oblique position also facilitates size comparisons and shows some of the object's three-dimensional look.
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