期刊
INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS
卷 49, 期 5, 页码 1469-1473出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/S0360-3016(01)01447-X
关键词
fetal dose; leakage radiation; radiotherapy; pregnant patient; peripheral dose
Purpose: To investigate the effectiveness of a simple and practical shielding device to reduce fetal dose for a patient undergoing radiation therapy of nasopharyngeal carcinoma, Methods and Materials: Using 5-cm-thick lead bricks and a heavy-duty steel cart, a 50 x 50-cm portable shield was designed and fabricated to reduce fetal dose due to collimator scatter and head leakage radiation. With the gantry at 90 degrees /270 degrees the shield can be easily positioned between the machine head and the fetus to reduce peripheral dose. Dose measurements for 6-MV X-rays and 9-MeV electrons have been made, utilizing a Rando phantom, to quantify the effect of the shield. Results: Measurements show that the peripheral dose to the fetus can be reduced by 60% when the simple shielding device is used. (C) 2001 Elsevier Science Inc.
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