Practical MTF calculation in digital mammography: a multicenter study

Frank Rogge; Hilde Bosmans; Guy Marchal

doi:10.1117/12.535823

6 May 2004 Practical MTF calculation in digital mammography: a multicenter study

Frank Rogge, Hilde Bosmans, Guy Marchal

Proceedings Volume 5368, Medical Imaging 2004: Physics of Medical Imaging; (2004) https://doi.org/10.1117/12.535823
Event: Medical Imaging 2004, 2004, San Diego, California, United States

Abstract

MTF is accepted as a measure for sharpness of a detector system, but analysis of one system by different researchers often results in differences. This can be due to differences in exposure setup or calculation algorithm. In this multicenter study, we investigate which options in the algorithm for the edge method result in differences in MTF. Three edge images were sent for analysis to nine participants, together with a questionnaire about different steps in their algorithm. One image was generated synthetically and is scatter-free and noise-free. The other images were created with an edge phantom between two slabs of 2 cm PMMA and were known to have a slight difference in MTF. The results were compared in both absolutely and relatively. All participants could calculate the MTF from the images. Although there are numerous differences between the different implementations, the results for the synthetical image are quite similar. This indicates that the algorithms perform similarly in noise-free and scatter-free conditions. With the real images, larger deviations are observed. The implementations can be divided in two groups according to their ability to reproduce a low frequency drop. The main difference between both groups was the use of data conditioning prior to the Fourier transform. In the group with low frequency drop, only slight absolute differences are observed. The other algorithms show larger differences. These differences underline the need for guidelines if the MTF curve gets a crucial role in the acceptance of a digital mammography system.

Citation Download Citation

Frank Rogge, Hilde Bosmans, and Guy Marchal "Practical MTF calculation in digital mammography: a multicenter study", Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); https://doi.org/10.1117/12.535823

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