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Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software

Wan Hassan, Wan Muhamad Saridan (2002) Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software. Physica Medica, 18 . pp. 25-31. ISSN 1120-1797

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Abstract

Two ways to calculate the modulation transfer function (MTF) of radiographic screen-film systems from the measured square wave response function (SWRF) data were investigated with an interactive curve fitting software. The measured SWRF data obtained by digitising a radiographic image of a bar pattern test object were fitted to a curve, and the fitted curve was used to calculate the MTF. Satisfactory MTF was obtained by using 12 terms in the calculation. A second version of the calculation included a correction for the normalization at 0.25 cycles/mm of the SWRF data. Measurements from a screen-film combination showed that the MTF of the first version was higher than the second by an average amount of 0.02 units for spatial range 0-3.5 cycles/mm, and on average the MTF of the first version was higher than the second by 10%. Both the SWRF data fitting and the MTF calculation were done within an interactive curve fitting software which made the calculation relatively easy to perform.

Item Type:Article
Uncontrolled Keywords:medical radiography, modulation transfer function, screen-film system, square wave response function
Subjects:Q Science > QC Physics
Divisions:Science
ID Code:6750
Deposited By: Dr Wan Muhamad Saridan Wan Hassan
Deposited On:04 Nov 2008 01:40
Last Modified:01 Jun 2010 15:46

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