The variance of bladder and rectal doses calculated from orthogonal and simple stereo films in cervix high-dose-rate brachytherapy

PURPOSE: To examine the variance in dose to the bladder and rectum during high-dose-rate brachytherapy for cervical cancer for two imaging techniques. An investigation into the patient skin dose from both techniques was also undertaken. METHODS AND MATERIALS: We examined how the variance in dose to critical structures (bladder and rectum) was affected by the degradation of image quality introduced by increasing the lateral separation in a …