Fig. 1.
Overview of study workflow. Planning and each CTOR imageset were rigidly aligned to implanted fiducials to mimic CBCT alignment. Next, fractional doses were determined by loading the original plan information to each CTOR and delivering the treatment based on the fiducial alignment. From the absolute fractional DVHs, dose to the TVI, GTV, and OARs were accumulated by DVH summation. Finally, fractional and total dose variations were analyzed.