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
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.
|Uncontrolled Keywords:||medical radiography, modulation transfer function, screen-film system, square wave response function|
|Subjects:||Q Science > QC Physics|
|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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