Figure 2.

Algorithm flowchart for selecting filled FDBF channels in one view. $\mathit{F}$ is a 41 by 38 matrix indicating the filling condition of FDBF channels. An FDBF channel in row r and column c is filled if $F_{r,c}=1$ and is empty if $F_{r,c}=0$. $S_{i,1}$ and $S_{i,2}$ are the lowest and highest rows of FDBF section $i$, respectively. $\mathit{T}$ is a 1D array containing the desired attenuation profile (of FDBF plus object) of one view, each element corresponding to a detector channel, and $g(\mathit{F})$ is a function to calculate the achieved attenuation profile (of FDBF plus object) resulting from the FDBF with $\mathit{F}$ filling condition.