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. 2019 Oct 14;20:9–12. doi: 10.1016/j.ctro.2019.10.002

Fig. 3.

Fig. 3

Out-of-field dose per fraction for helical tomotherapy (HT), volumetric arc therapy (VMAT), and flattening filter-free VMAT (FFF-VMAT). Horizontal axis shows the distance [cm] from the edge of the planning target volume. Rectal doses are shown as “patient rectum (FFF-VMAT).” Distances of 40 cm and 62.5 cm correspond to the umbilicus and pubic symphysis, respectively, on the phantom. Distances of 32 cm and 55 cm correspond to the umbilicus and pubic symphysis, respectively, of the patient.