Matlab has some data from an MRI scan built-in. You can load it with the three lines;

load mri; %load the sample data from Mathworks D = double(squeeze(D)); %Dont worry about this step, but you need it D=D/max(D(:)); %Normalize to 0-1 range

Youll find that D has size 128 128 27 Write a function showslice(MRIdata, slice) that displays the specified slice as an image.