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• W2263313446 abstract "The relationship between noise variance and spatial resolution in grating-based x-ray phase computed tomography (PCT) imaging is investigated with reverse projection extraction method, and the noise variances of the reconstructed absorption coefficient and refractive index decrement are compared. For the differential phase contrast method, the noise variance in the differential projection images follows the same inverse-square law with spatial resolution as in conventional absorption-based x-ray imaging projections. However, both theoretical analysis and simulations demonstrate that in PCT the noise variance of the reconstructed refractive index decrement scales with spatial resolution follows an inverse linear relationship at fixed slice thickness, while the noise variance of the reconstructed absorption coefficient conforms with the inverse cubic law. The results indicate that, for the same noise variance level, PCT imaging may enable higher spatial resolution than conventional absorption computed tomography (ACT), while ACT benefits more from degraded spatial resolution. This could be a useful guidance in imaging the inner structure of the sample in higher spatial resolution." @default.
• W2263313446 created "2016-06-24" @default.
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• W2263313446 date "2015-09-29" @default.
• W2263313446 modified "2023-09-23" @default.
• W2263313446 title "Investigation of noise properties in grating-based x-ray phase tomography with reverse projection method" @default.
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• W2263313446 doi "https://doi.org/10.1088/1674-1056/24/10/108702" @default.
• W2263313446 hasPublicationYear "2015" @default.
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