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Table 4 Comparison of GI, delivery time and MUs among the three techniques

From: Advanced nasopharyngeal carcinoma radiotherapy with volumetric modulated arcs and the potential role of flattening filter-free beams

Parameters RA-FFF RA IMRT p value p1 p2 p3
GI 98.53% ± 1.02% 98.49% ± 1.28% 98.66% ± 1.04% 0.746
Time(s) 152 ± 7 153 ± 7 493 ± 24 < 0.001 0.539 0.005 0.005
MUs 536 ± 46 501 ± 25 1199 ± 129 < 0.001 0.022 0.005 0.005
  1. Abbreviations: GI = gamma index; MUs = monitor units; Other abbreviations as in Table 2.