Simple Computation of the Approximated Modulation Transfer Function (MTF) Using Spreadsheet-software: Method and Evaluation in Five Maxillofacial CBCT-devices

Overview

Journal Dentomaxillofac Radiol

Publisher Oxford University Press

Date 2019 Feb 2

PMID 30707644

Citations 3

Authors

Ralf Kurt Willy Schulze

Clara I Doering

Affiliations

Soon will be listed here.

Abstract

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.org/gnumeric/downloads.shtml ). By means of the integrated fast Fourier transformation Fourier coefficients are obtained from the line spread function which can then be plotted spatial frequency to obtain MTF-plots. For the experimental evaluation an edge test object was exposed in five commercial CBCT devices for maxillofacial applications.

Results: The MTF as obtained from the above-described manual method at 10% modulation ranged between 1.6 and 2.3 cycles/mm. Reproducibility as expressed as relative differences between single assessments ranging between 3% and 11%. The computed MTF-values compare well with results from the literature.

Conclusions: The method introduced can be used to manually and reliably estimate a CBCTs' MTF as one central parameter for the imaging systems' performance.

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