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31 March 2016Noise power spectrum studies of CT systems with off-centered image object and bowtie filter
In previous studies of the noise power spectrum (NPS) of multi-detector CT (MDCT) systems, the image object
was usually placed at the iso-center of the CT system; therefore, the bowtie filter had negligible impact on the
shape of the two-dimensional (2D) NPS of MDCT. This work characterized the NPS of off-centered objects
when a bowtie filter is present. It was found that the interplay between the bowtie filter and object position has
significant impact on the rotational symmetry of the 2D NPS. Depending on the size of the bowtie filter, the
degree 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. An
anisotropic NPS corresponds to structured noise texture, which may directly influence the detection performance
of certain low contrast detection tasks.
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Daniel Gomez-Cardona, Juan P. Cruz-Bastida, Ke Li, Adam Budde, Jiang Hsieh, Guang-Hong Chen, "Noise power spectrum studies of CT systems with off-centered image object and bowtie filter," Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97833A (31 March 2016); https://doi.org/10.1117/12.2217441