MRI K-space to image: why track frequencies in two dimensions?
in MRI, you don't start with the image as pixels in spatial domain, but with the k-space data!
So, you don't &quot;construct k-space from the image&quot;, you &quot;construct the image from k-space&quot;, which takes a 2D inverse Fourier transform.
And that's not &quot;do it row-by-row&quot;; that is &quot;do it on all rows, then all columns of the result&quot;.