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• W1988680296 endingPage "3118" @default.
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• W1988680296 abstract "In cone beam breast computed tomography (CT), scattered radiation leads to nonuniform biasing of CT numbers known as a cupping artifact. Besides being visual distractions, cupping artifacts appear as background nonuniformities, which impair efficient gray scale windowing and pose a problem in threshold based volume visualization/segmentation. To overcome this problem, we have developed a background nonuniformity correction method specifically designed for cone beam breast CT. With this technique, the cupping artifact is modeled as an additive background signal profile in the reconstructed breast images. Due to the largely circularly symmetric shape of a typical breast, the additive background signal profile was also assumed to be circularly symmetric. The radial variation of the background signals was estimated by measuring the spatial variation of adipose tissue signals in front view breast images. To extract adipose tissue signals in an automated manner, a signal sampling scheme in polar coordinates and a background trend fitting algorithm were implemented. The background fits compared with targeted adipose tissue signal value (constant throughout the breast volume) to get an additive correction value for each tissue voxel. To test the accuracy, we applied the technique to cone beam CT images of mastectomy specimens. After correction, the images demonstrated significantly improved signal uniformity in both front and side view slices. The reduction of both intraslice and interslice variations in adipose tissue CT numbers supported our observations." @default.
• W1988680296 created "2016-06-24" @default.
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• W1988680296 date "2007-06-27" @default.
• W1988680296 modified "2023-10-06" @default.
• W1988680296 title "A post-reconstruction method to correct cupping artifacts in cone beam breast computed tomography" @default.
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• W1988680296 doi "https://doi.org/10.1118/1.2748106" @default.
• W1988680296 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1995653" @default.
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