Dose distribution obtained by the whole pelvic conformation technique combined with intracavitary irradiation in the radiotherapy of carcinoma of the uterine cervix

After the conformation radiotherapy to the whole pelvis of the patient with carcinoma of the uterine cervix in the stage I and II, the volume dose and the doses given to the bladder and the rectum are reduced in the case treated by the intracavitary radium irradiation as compared with the conformation radiotherapy constricted to the primary lesion. Using the radiation therapy planning system (MODULEX), the calculation of dose distribution obtained by the intracavitary irradiation and the conformation technique is precise enough to be accepted clinically although the estimated dose is scarcely low in the low dose region. The dose distribution shows no difference in the volume dose but the doses to the small intestine, bladder and rectum are reduced by the two axial pendulous conformation technique as compared with the standard conformation technique for the whole pelvic irradiation. (author)