but once I've made my measurements in k space then actually image reconstruction is trivial I just applied the Fourier transform and I get back my image so that is a relatively slow process because I have to acquire these measurements in k space sequentially and of course if I want to for example create dynamic images of the heart I have to keep on doing the same thing over and over again but actually the heart is only changing a bit between these different acquisitions so there's an enormous amount of spatial temporal