Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40880-017-0191-x/MediaObjects/40880_2017_191_Fig1_HTML.jpg)
Schematic representation of californium-252 (252Cf) neutron brachytherapy (NBT). Contrast media was injected into a Foley catheter. Then, three passive cavity applicators were inserted into the uterine cavity and bilateral fornix; the applicator that delivers 252Cf was inserted and fixed to the vagina and uterine cavity. Finally, orthogonal radiographs of the pelvic cavity were acquired from the antero-posterior (a) and lateral (b) directions. The yellow arrows indicate the cavity applicators