cases.
% 
% For DICOM data, you’ll need image processing toolbox on MATLAB and <https://octave.sourceforge.io/dicom/index.html 
% dicom package> on Octave (untested).
% 
% For 3D volumetric visualization, there is built-in support for <https://www.mathworks.com/matlabcentral/fileexchange/22940-vol3d-v2 
% vol3d> in <https://github.com/villekf/OMEGA/blob/master/visualize_pet.m#L344 
% visualize_pet.m>.
% 
% For random subset sampling (|subset_type = 3|), it is recommended to use <https://www.mathworks.com/