مقايسه دوز تجويزي و دوز جذبي در ميدانهاي درماني فانتوم جامد تنه در بيماريهاي هوچكين و آدنوكارسينوماي رحم

Comparison of prescribed and absorbed doses in solid phantom treatment fields of body in patients with Hodgkin and uterine adenocarcinoma

Success in radiotherapy depends on precision and accuracy of the absorbed dose by a tumor. Since direct measurement of the absorbed dose is impractical, the tissue substitution (phantom) is used. This study has carried out to compare the prescribed and absorbed doses of body treatment fields in patients with Hodgkin and uterine adenocarcinoma. Treatment approach was carried out on phantom and the absorbed dose in the center of tumor and out of central axis was measured using thermoluminecence dosimeter (TLD). In both diseases the prescribed dose in tumor center was 100 cGy. In Hodgkin patient, the absorbed doses in tumor center in mediastinum, right axillary lymph node, left subclavicular lymph node and left sub-shielded lung was 107.83, 153.58, 124.71 and 9.81 cGy respectively. In uterine adenocarcinoma the absorbed dose in tumor center was 103.76 cGy and in right ovary 90.11 cGy. The measured doses in tumor center by TLD and Farmer dosimeter showed no significant difference. Overall, our results showed that the use of solid phantom may be useful for measuring the difference between the prescribed and absorbed doses and for minimizing the difference and it might be necessary in all radiotherapy centers.