Abstract
Mammography is a critical medical imaging procedure concerning resolution due to the features of the details of clinical interest for the diagnosis, such as specifically the microcalcifications. Nonisotropic mammographic systems usually present discrepant dimensions of the effective focal spot between the parallel and the perpendicular axes relative to the tube axis, and this may cause a significant difference in microcalcifications sharpness, depending on the location where they are positioned. We could previously verify that there are regions of the radiation field in nonisotropic systems where sharper images can be obtained, named as Optimum Region. This work is about the determination of the Optimum Region for nonisotropic mammographic systems, by means of developing a procedure which determines the modulation transfer function (MTF) due to the focal spot by simulation. This procedure allows to obtain the MTFs corresponding to any orientation and location of the field, and, by a quantitative analysis of the MTFs curves, the Optimum Region can be determined. Comparisons with phantom images obtained in actual mammographic systems has shown that the Optimum Regions found by the MTF method were in agreement with the subjective visual analysis of the microcalcifications sharpness.
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