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• W2149156794 startingPage "369" @default.
• W2149156794 abstract "Fractal analysis is a method of characterizing complex shapes such as the trabecular structure of bone. Numerous algorithms for estimating fractal dimension have been described, but the Fourier power spectrum method is particularly applicable to self-affine fractals, and facilitates corrections for the effects of noise and blurring in an image. We found that it provided accurate estimates of fractal dimension for synthesized fractal images. For natural texture images fractality is limited to a range of scales, and the fractal dimension as a function of spatial frequency presents as a fractal signature. We found that the fractal signature was more successful at discriminating between these textures than either the global fractal dimension or other metrics such as the mean width and root-mean-square width of the spectral density plots. Different natural textures were also readily distinguishable using lacunarity plots, which explicitly characterize the average size and spatial organization of structural sub-units within an image. The fractal signatures of small regions of interest (32x32 pixels), computed in the frequency domain after corrections for imaging system noise and MTF, were able to characterize the texture of vertebral trabecular bone in CT images. Even small differences in texture due to acquisition slice thickness resulted in measurably different fractal signatures. These differences were also readily apparent in lacunarity plots, which indicated that a slice thickness of 1 mm or less is necessary if essential architectural information is not to be lost. Since lacunarity measures gap size and is not predicated on fractality, it may be particularly useful for characterizing the texture of trabecular bone." @default.
• W2149156794 created "2016-06-24" @default.
• W2149156794 creator A5016226269 @default.
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• W2149156794 date "2001-07-01" @default.
• W2149156794 modified "2023-09-26" @default.
• W2149156794 title "Fractal signature and lacunarity in the measurement of the texture of trabecular bone in clinical CT images" @default.
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• W2149156794 doi "https://doi.org/10.1016/s1350-4533(01)00057-1" @default.
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• W2149156794 hasPublicationYear "2001" @default.
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