Figure 4From: A new anisotropy index on trabecular bone radiographic images using the fast Fourier transformSynthetic images a: Synthetic image of astructure with orientations between 0 and 80° in 3 dimensional space b: Fast Fourier Transform (FFT) spectrum of the image 4a c: Synthetic image of a structure with orientations between 0 and 17° in 3 dimensional space d: FFT spectrum of the image 4cBack to article page