MR data for Exercise 7

The MR data for exercise 7 is contained in the file MRdata.mat. The data can be downloaded here. It contains the raw MR data used for the reconstruction. Note that the file is very large (28 MBytes), so it might take some time to download.

The EPI MR raw data can be loaded into matlab using the commands:

load('MRdata.mat');
% Dimensions of raw are slices, coils, y, x:
[nslc, ncoil, ny, nx] = size(raw);

For each slice and coil, raw is a 128 x 128 matrix of complex measurements, S=S_x+i S_y, where the signals S_x and S_y are proportional to the components of the total transverse magnetization in orthogonal directions x and y. Each line raw(slc,coil,Cy,:) is measured on a positive or negative gradient lobe (moving right or left in k-space).

The text for exercise 7: MR scanning, can be found here (pdf file)