fig5.mat contains the following variables:

- bta_TVMAPSLR                          The beta value used for the 3D experiments
- whiteMatterPixelVals_TVMAPSLR         
- whiteMatterPixelVals_MLEM_double      
- whiteMatterPixelVals_MLEM             
- greyMatterPixelVals_TVMAPSLR          
- greyMatterPixelVals_MLEM_double       
- greyMatterPixelVals_MLEM              

Each of these variables (apart from the beta parameter) is of the following structure:
A 2-element cell array, where each cell corresponds to either PET1 or PET2. In each cell
we have a N x M x K array where the N is the number of voxels in the analysis region 
(36 for grey matter, 64 for white matter), M is the number of iterations (100), and K is
the number of noisy realisations. In this way, these variables contain all recorded voxel
values in the ROIs for the case where the PET2 tumour reduces in size and intensity.