es (line 821) with 
% the use of the special forward and backward projection operators. The major 
% steps needed for class based use is the creation of the class object with |forwardBackwardProject(options)| 
% and the load of the measurement data. Sensitivity image can be obtained from 
% the backprojection. PSF is applied automatically if selected.
% 
% You can also create the same class object as above without the need for any 
% of the main-files, however, several features are then unavailable (such as