Reference lines for oblique axial MR imaging of the brain.

Reference lines that correspond to the three reference lines used at computed tomography were determined on 50 normal midsagittal magnetic resonance brain images. Lines were drawn from the mammillary body to the posterior tentorial attachment to the sinus (orbitomeatal), from the center of the pituitary gland to the posterior tentorial attachment to the sinus (Reid baseline), from the mammillary body to the posterior edge of the fourth ventricle (supraorbitomeatal).