Repainting: Repainting (aka rescanning) has the potential to reduce interplay effects. The spacing between rescans in breath-sampled (BS) techniques was set at planning, based on the average breathing cycle length obtained in conjunction with CT acquisition. BS techniques (aka repainting with delays) are superior to layered and volumetric repainting with respect to both target coverage and variability in dose to OARs. For moderately varied breathing cycle lengths between planning and delivery (up to 15%), the breath-sampled techniques still mitigate the interplay effect well.