Table 2.

Comparison of the CTV gEUD among the static, average- and segment-based convolution plans delivered in a single fraction and in 37 fractions (entire treatment course). The single-fraction plans incorporated the tracking data from the fractions with largest SD and mean; while the plans for the entire treatment incorporated the motion of the patient with largest overall SD. Column 3 shows the differences due to the interplay effect (i.e., differences between the two convolution methods) while column 4 shows the differences due to the combined effect of the intrafraction motion and interplay.

Motion scenario	IMRT plan	%(∣gEUDseg conv−gEUDave conv∣∕gEUGseg conv) (interplay effect)	%(∣gEUDseg conv−gEUDstatic∣∕gEUDseg conv) (motion and interplay effect)
Single fraction with largest motion variation (SD)	1	0.9	1.7
	2	1.3	1.7
Single fraction with largest mean motion	1	1.2	1.0
	2	1.1	2.1
Patient with largest motion variation (SD)	1	0.0	0.1
	2	0.0	0.1