A Study on the MTF Measurement Methods of the Radiographic Screen-film System

Abstract

It is necessary for study of the MTF measurement method to know true MTF. Photographic characteristic curve, noise and MTF were modeled on the basis of experimental data. Density porofiles for five methods were obtained with simulations of imaging process by the use of the models. MTF's were measured from the density profiles under a number of conditions of sampling and calculation Measured MTF's were compared with true MTF modeled, and an optimal measurement condition was determined for each method. It was found that the slit method with the multiple-exposure technique was the most accurate one.