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| The Dosimetric Effect of the Angle Change after Electron Beam Irradiation for the Patients after Breast Surgery |
| WANG Chun-yu1, WANG Tie-jun2, MAO Tie-zhu2, CHEN Da-wei1, WANG Hong-wei1, CHEN Chong1 |
1. School of Public Health, Jilin University, Changchun 130021 China;
2. The Secend Hospital of Jilin University |
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Abstract Objective To study the dosimetric effect of the rotational angle change after electron beam irradiation after breast surgery.Methods The standard manikins model was used to simulate the female patients'left breast cancer, and was irradiated by 6 MeV electron beam at the horizontal position. The irradiatves dosimetry of target was 2 Gy. The irradiation was set 350°、355°、0°、5°、10° rotational angle change and applied 0.5 mm tissue equivalent bolus. Thermoluminescence dose meters was used to measure the dosimetric effect of chest wall, two lungs and heart.Results After set 350°、355°、0°、5°、10° rotational angle change, the dose of chest wall had no significant change. The dose change of chest wall in two sides at 355° and 5°rotational was higher than that of the middle parts, but the differences have no significant change(t=1.418,P > 0.05); sensitive organs had significant change, the dose of the same lung and the contralateral lung in control group was(0.79 ±0.15) Gy and(0.21 ±0.08) Gy, and in 5° rotational angle change group was(1.06 ±0.23) Gy and(0.31 ±0.11) Gy,the differences have significant change(t=2.42,t=3.14,P < 0.05).Conclusion In the process of electron beam irradiation for the patients with breast cancer, the rotational angle change degrades the dosimetric coverage of target organs' edge, and the 5° rotational angle change increases dosimetric coverage in the same lung and the contralateral lung.
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Received: 12 October 2015
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