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Updated: May 14, 2026

Precision Measurements and Parametric Models of Vertebral Endplates
Published on: September 17, 2019
Sagittal and meridional radii of curvature for a surface with symmetry of revolution by using a null-screen testing
Amilcar Estrada-Molina1, Manuel Campos-García, Rufino Díaz-Uribe
1Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Mexico. amilcar.estrada@ccadet.unam.mx
Abstract:
An algorithm to compute the sagittal and meridional radii of curvature for a surface of revolution is presented. The sagittal radius is obtained from the surface normal, and the meridional radius is calculated from a function fitted to the derivative of the sagittal curvature by using the surface-normals raw data. A calibration spherical surface is tested by using the null-screen testing method. Experimental results of the spherical surface show that the sagittal and meridional radii of curvature differ by 2.600% and 2.604%, respectively, with respect to the actual radius of the calibration spherical surface.
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