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Proceedings Paper

Practical MTF calculation in digital mammography: a multicenter study
Author(s): Frank Rogge; Hilde Bosmans; Guy Marchal
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Paper 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.

Paper Details

Date Published: 6 May 2004
PDF: 9 pages
Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); doi: 10.1117/12.535823
Show Author Affiliations
Frank Rogge, Univ. Hospitals Leuven (Belgium)
Hilde Bosmans, Univ. Hospitals Leuven (Belgium)
Guy Marchal, Univ. Hospitals Leuven (Belgium)


Published in SPIE Proceedings Vol. 5368:
Medical Imaging 2004: Physics of Medical Imaging
Martin J. Yaffe; Michael J. Flynn, Editor(s)

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