Simple computation of the approximated modulation transfer function (MTF) using spreadsheet-software: method and evaluation in five maxillofacial CBCT-devices.

Objectives: To develop a simple way to compute the approximated modulation transfer function (MTF) manually using conventional spreadsheet software.

Methods: Basing on an edge-image a method was developed, facilitating computation of the edge spread and line spread function in open-source spreadsheet software (Gnumeric; http://projects.gnome.