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Investigation of parameters concerning the modulation transfer function in digital radiography

Magazine article
Authors Magnus Båth
Patrik Sund
Lars Gunnar Månsson
Published in Proceedings of SPIE - The International Society for Optical Engineering
Volume 4320
Pages 350-361
ISSN 0277-786X
Publication year 2001
Published at Institute of Selected Clinical Sciences, Department of Radiation Physics
Pages 350-361
Language en
Keywords Digital radiography , Image quality , Modulation transfer function , MTF
Subject categories Radiological physics


The effects of the design of a radiographic system on the modulation transfer function (MTF) are studied with a specially developed computer program. The program simulates a digital radiographic system by using three parameters: sampling distance, sampling aperture, and the spread of the signal in the detector due to the interaction processes of the incoming photons. The signal spread is approximated by Gaussian distributions. The influence of the three parameters is studied on the presampling MTF and on the two extreme cases of the digital MTF: The maximum MTF and the minimum MTF. From theoretical data on the interaction processes, the resolution properties of an amorphous selenium flat-panel detector are simulated. The program is also used to simulate a measurement of the presampling MTF with the slit method, and the effect of the slit width on the measured presampling MTF is examined.

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