Dosimetric Influence of Uterus Position in Cervix Cancer High-Dose-Rate Brachytherapy

摘要

Brachytherapy is an integrating component for the treatment of locally advanced cervical cancer. While most women present anteverted or intermediary position uterus, only 20–25% have retroverted uterus. We evaluated 418 high-dose-rate brachytherapy plans of patients diagnosed with biopsy proven cervical cancer. Urinary bladder and rectal points were identified on the orthogonal digital X-ray images according to ICRU Report no.38. The brachytherapy plans were divided according to uterus position into three groups, anteverted, intermediary and retroverted, respectively. The statistical analysis of the dosimetric data confirmed that uterus axis influences radiation doses received by the urinary bladder and rectum.