Planes of Reference for Orbital Fractures: A Technique for Reproducible Measurements of the Orbit on Computed Tomography Scans.

Purpose: Planes of reference for orbital fractures (PROF) was developed to standardize measurements made on orbital computed tomography scans. This study describes the use of PROF in determining the location along the orbital floor where the posterior ledge (PL) most commonly occurs. The transverse inclination and anterior-posterior inclination of the orbital floor will also be measured.