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Proceedings Paper

Physical-model-based scatter correction in mammography
Author(s): Michel Darboux; Jean-Marc Dinten
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Paper Abstract

Scatter might significantly alter the diagnosis in mammography. For example, the sharpness of a mass edge is an important indicator of malignancy. Unfortunately scatter can blur the edges and so make the diagnosis harder. Sharpness enhancement, based on image processing might wrongly sharpen a smooth edge and so alter the diagnosis. We present here a scatter correction method based on the physical equations. The main problem of this approach lies on the non-knowledge of the three-dimensional structure of the object. In order to be able to calculate the map of scattered intensity using the physical laws, we propose an approximation of this structure derived from the primary x-ray flux map representative of its projection. This approximation takes into account the physical parameters relative to x-ray interactions in breast tissues, as well as geometric parameters characterizing the acquisition procedure. This approximation allows us to build an equivalent object for x- ray photons scattering, and the physical laws can be applied to this equivalent object. The validity of this approximation has been evaluated on simulated objects. Finally to remove the scattering flux, we propose an inversion scheme to build the primary flux from the observed flux. The obtained primary flux map is then representative of the projection of the 3D structures of the breast. To validate our scatter correction model, we have developed a direct simulation model taking into account the true 3D model is then compared to the result from the approximated model. The performances of our scatter correction approach will be validated on phantoms representative of the structure and the components of the breast.

Paper Details

Date Published: 2 May 1997
PDF: 6 pages
Proc. SPIE 3032, Medical Imaging 1997: Physics of Medical Imaging, (2 May 1997); doi: 10.1117/12.274008
Show Author Affiliations
Michel Darboux, CEA-LETI Technologies Advancees (France)
Jean-Marc Dinten, CEA-LETI Technologies Advancees (France)

Published in SPIE Proceedings Vol. 3032:
Medical Imaging 1997: Physics of Medical Imaging
Richard L. Van Metter; Jacob Beutel, Editor(s)

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