Figure 2a. (a) Hypothetical one-dimensional object consisting of only two spatial sinusoids. (b) Continuous Fourier transform of the object contains nonzero values only at the frequencies of the two sinusoids. (c) The k-space raw data are essentially a sampled version of the Fourier transform in b. Imaging parameters determine the frequency and extent of the sampling. In this case, the spatial resolution was chosen such that sampling was performed only out to kxmax = ±32; therefore, the high-frequency information at kx = ±40 are not present in the raw data. (d) Plot of the DTFT of the data in c (dark curve). The DTFT function (Eq [13]) represents the sampled raw data with infinite spatial resolution; however, it does not contain the high-frequency components present in the original object (light curve and part a).