English: This image is taken from the text book "Maier, Andreas, et al., eds. Medical Imaging Systems: An Introductory Guide. Vol. 11111. Springer, 2018.". The whole book is published under CC 4.0 BY license and can be freely used. Please reference the book, if you intend to use this figure in your own work.
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A visual explanation of the Fourier Slice Theorem: The parallel 2-D projection in spatial domain and subsequent 1-D Fourier transform is identical to a slice through 2-D Fourier space.