Temporal correlation of scanning progress and organ motion. Dose calculation requires temporal correlation of scanning progress and organ motion. a) Based on a motion trajectory the actual motion phase is determined. In this example 10 motion phases were used. b) Scanning progress is determined by the extracted beam intensity and the number of particles per grid position Nij. Scanning progress, i.e. the delivery time of each grid position, is not linear because Nijcan differ within iso-energy slices (left). Signal heights are plotted in arbitrary units.