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Schematic drawing explaining the analysis process. Two parallelized projection images at 0° and at 180° are each reformatted from a continuous sequence of 78 cone-beam projections. The 180° projection was mirrored and compared to the 0° projection to calculate SSD and NCC-based estimates of motion (QMESSD and QMENCC, respectively). For the ideal case where there is no motion, the difference image between the two parallelized projection images should be zero.
