><span style=' font-family: monospace;'>B = formMatrix(A, subset_number)</span><span>, where </span><span style=' font-family: monospace;'>subset_number</span><span> can be omitted if the entire system matrix is required.</span></div>
<br>
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%% Custom detector coordinates and/or list mode reconstruction
% This page details on how to separately compute the forward and/or backward 
% projections when using OMEGA.
%% Computing the forward and/or backward projections
% When you are 