3 May 2002 Thickness-dependent scatter correction algorithm for digital mammography
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Abstract
We have implemented a scatter-correction algorithm (SCA) for digital mammography based on an iterative restoration filter. The scatter contribution to the image is modeled by an additive component that is proportional to the filtered unattenuated x-ray photon signal and dependent on the characteristics of the imaged object. The SCA's result is closer to the scatter-free signal than when a scatter grid is used. Presently, the SCA shows improved contrast-to-noise performance relative to the scatter grid for a breast thickness up to 3.6 cm, with potential for better performance up to 6 cm. We investigated the efficacy of our scatter-correction method on a series of x-ray images of anthropomorphic breast phantoms with maximum thicknesses ranging from 3.0 cm to 6.0 cm. A comparison of the scatter-corrected images with the scatter-free signal acquired using a slit collimator shows average deviations of 3 percent or less, even in the edge region of the phantoms. These results indicate that the SCA is superior to a scatter grid for 2D quantitative mammography applications, and may enable 3D quantitative applications in X-ray tomosynthesis.
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Dinko E. Gonzalez Trotter, Dinko E. Gonzalez Trotter, J. Eric Tkaczyk, J. Eric Tkaczyk, John Kaufhold, John Kaufhold, Bernhard E. H. Claus, Bernhard E. H. Claus, Jeffrey W. Eberhard, Jeffrey W. Eberhard, } "Thickness-dependent scatter correction algorithm for digital mammography", Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002); doi: 10.1117/12.465591; https://doi.org/10.1117/12.465591
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