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Comparative Study of Dose Distribution Homogeneity between 3D-Brachytherapy and Intensity Modulated Radiation Therapy Techniques in Cervix Cancer Tumors

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2019年第3期8卷 163-174页

作者： mostafa elnagger Hussein A. Motaweh Kareman Zard Cancer Department Management and Research Medical Research Institute Alexandria University Alexandria Egypt Physics Department Faculty of Sciences Damanhour University Damanhour Egypt Medical Physics Department Alexandria Ayadi Almostakbl Oncology Center (AAAOC) Alexandria Egypt

Aim: The purpose of this study was to compare the dosimetric results of the techniques (3D-Brachytherapy and intensity-modulated radiotherapy IMRT) in patients with locally advanced cervical carcinoma (LACC). Method: There are 15 patients with locally advanced cervical carcinoma (LACC), after the completion of external beam radiotherapy (EBRT) for the whole pelvic irradiation 45 Gy/25 fractions, followed by 3D-Brachytherapy 24 Gy per weekly fractions and 36 Gy of IMRT per 18 fractions. Coverage of targets volume and doses received by normal tissue were compared in two techniques. Method: 15 patients of LACC treated with 3D-Brachytherapy were selected for this study. IMRT plans were also created for all the patients. 3D-Brachytherapy and IMRT plans were compared on the basis of target volume coverage, dose to Organs at risk (OAR’s), homogeneity index (HI) and conformity index (CI). Results: The results showed that D90% of HRCTV in the 3D-Brachytherapy was covered more than D90% of PTV in the IMRT of prescribed dose, the D2CC and the V60Gy values of Bladder and rectum were significantly lower than in 3D-Brachytherapy. The HI and CI in 3D-Brachytherapy were found better than IMRT. Conclusion: 3D-Brachytherapy significantly reduced the irradiated volume of OAR’s and improved dose coverage in tumor volume compared to that by IMRT.

关键词： IMRT 3D-Brachytherapy Cervical Cancer

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