Figure 2.

Illustration of workflow for generating clinically representative projection CBCT datasets from a highly sampled CBCT dataset using the Projection Striding (PS) and Phase‐Binned Striding (PBS) techniques. In both techniques, the objective is to downsample and extract a collection of projections belonging to a specific phase from the remaining projections. At each step, the set of projections is reduced (depicted as a darkening of the projection) according to either a uniform projection stride sampling or phase‐binning criteria. The upper‐right panel shows that the PS method may have significant view aliasing artifacts in regions of reconstructed anatomy that have been severely undersampled. The PBS technique does not exhibit an undersampling problem since it has a more even angular and phase‐distributed sampling of the projection space and results a more realistic representation of a clinical reconstruction. [Color figure can be viewed at wileyonlinelibrary.com]