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IORT – intracavitary devices (Intrabeam, Xoft)
Xiao et al. Int J Med Phys 4:184-195. 2015
4.5 cm
central source position – far from target
spherical target volume only
no geographical miss
symmetric margin – target is conformed
to spherical applicator, but no imaging
large dose inhomogeneity (68%/1 cm)
large dose gradient at target edge (58%/1 cm)
no dose modulation potential – skin retraction
and tungsten-filled sheets for shielding