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Fig. 6E —Fourier spaces and k-space
[7,
8]. MRI. This coronal slice of
a brain is interrogated for all its different spatial frequencies by
successively altering magnetic field gradients (open arrows in top three
images) during frequency- and phase-encoding. Although only three
examples are shown here, many different gradient combinations are necessary to
fill k-space. Inverse Fourier transform (iFT) of k-space essentially adds the
relative contributions of all spatial frequencies to give the final image.
