Dosimetric comparison of Co and Ir high dose rate source used in brachytherapy treatment of cervical cancer.

Purpose: The study purpose included dosimetric comparison of cobalt 60 (Co) and iridium 192 (Ir) high dose rate (HDR) source used in brachytherapy treatment of cervical cancer.

Materials And Methods: Computed tomography (CT) scans for 15 patients of carcinoma of uterine cervix using 3-mm slice thickness were considered for the study The contouring of high-risk clinical target volume (HRCTV), bladder, and rectum on CT images was done as per the GEC ESTRO guidelines with the help of magnetic resonance imaging images in the treatment planning system. All parameters were kept the same for Co (3.