Effect of Bladder Distension on Dosimetry in Brachytherapy of Cervical Cancer

"The brachytherapy applicator and a urinary catheter are set up in the operating room under general anesthesia.~Then, an MRI (or a scanner if contra-indication) is performed after a bladder filling with 120cc of normal saline solution and urinary catheter clamping.~Right after, a scanner is performed with urinary catheter declamping and emptied bladder.~Delineation of CTVs and organs at risk (bladder, rectum, sigmoid, small bowel), and dosimetric optimisation are made on study with filled bladder.~Then, organs at risk are delineated on the study with emptied bladder. The prior dosimetry is reset on this study and organs at risk doses are compared."