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- W2317962620 abstract "In previous studies of the noise power spectrum (NPS) of multi-detector CT (MDCT) systems, the image objectwas usually placed at the iso-center of the CT system; therefore, the bowtie filter had negligible impact on theshape of the two-dimensional (2D) NPS of MDCT. This work characterized the NPS of off-centered objectswhen a bowtie filter is present. It was found that the interplay between the bowtie filter and object position hassignificant impact on the rotational symmetry of the 2D NPS. Depending on the size of the bowtie filter, thedegree of object off-centering, and the location of the region of interest (ROI) used for the NPS measurements,the symmetry of the 2D NPS can be classified as circular, dumbbell, and a peculiar cloverleaf symmetry. Ananisotropic NPS corresponds to structured noise texture, which may directly influence the detection performanceof certain low contrast detection tasks." @default.
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- W2317962620 date "2016-03-31" @default.
- W2317962620 modified "2023-09-23" @default.
- W2317962620 title "Noise power spectrum studies of CT systems with off-centered image object and bowtie filter" @default.
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- W2317962620 doi "https://doi.org/10.1117/12.2217441" @default.
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