TAO Applicator 를 이용한 子宮頸癌 腔內照射時의 線量計算에 관한 考察

A Study on Dose Calculation in Intracavitary Radiotherapy of the Carcinoma of the Uterine Cervix with TAO Applicator

Various methods are available for determination of exposure time in intracavitary radiotherapy of the carcinoma of the uterine cervix. To determine the accuracy of dose calculation with isodose curve for TAO applicator, comparison with results calculated by computer for radiotherapy treatment planning was done in 24 procedures done in 12 consecutive patients with the carcinoma of the uterine cervix from May to December, 1983. The results are as follows: 1. The average dose rate per hour of point A was 87.70 rad, being 89.91 rad and 85.49 rad in left and right, respectively. 2. The average percentage of dose rate of point A calculated by isodose curve method over that by computer was 101.28% and the difference was less than 5% in 17 procedures and over 10% in only 3 procedures. 3. The average percentage in case of point B was 108.65%. In conclusion, in most cases the difference was less than 200 rad for point A and less than 100 rad for point B during 2 courses of intracavitary radiotherapy. And so the dose rate calculation with isodose curve for TAO applicator is comparatively accurate.