Fig. 1.

Figure showing (A) intracavitary brachytherapy applicators: Fletcher applicator on the left and ring applicator on the right, (B) diagram showing comparative geometry of the two applicators, (C) assembled applicators – ring applicator above and Fletcher applicator below. Fletcher applicator is a flexible geometry three-applicator system, the positioning which may be asymmetric depending on the shape and symmetry of the vaginal fornix. The assembled Fletcher apparatus exhibits a wider distribution at the level of the ovoids as well as thicker anterior-posterior distribution. Ring applicator is a fixed-geometry two-applicator system. Patients with shallow vaginal fornices or partially fixed utero-vaginal anatomy not matching the geometry of the ring applicator cause difficulty in proper placement of the applicators