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Research Paper | Radiological Sciences | Saudi Arabia | Volume 3 Issue 6, June 2014

Estimation of Dose Received by Sensitive Organs in External Radiation Therapy of Cervical Carcinoma

Mohamed E. M. Gar-Alnabi | Enaam A. Mohamed | Mohamed A. Ali Omer | Ghada A. E. Sakin ^[2] | Mohammed Farahna

Abstract: The main objective of this study was to estimate dose received by sensitive organs in cervical carcinoma irradiation; out of 200 patients referred to Radiation and Isotopes Center of Khartoum (RICK). After successful investigations; the patients were decided to receive a radical radiotherapy course for stage I and II without hematologic spread. The collected variables were the organs position and depth; patients separations; equivalent field size; percentage depth dose DD % and back scatter factor. The graphs and correlation were carried out using EXCELL software and the analysis of results showed that: the bladder; cervix and rectum were situated parallel to each other from anterior to posterior respectively and they have linear correlation in depth wise with patient separation based in equation: y = 0.38x + 5.56; y = 0.39x + 1.82; y = 0.4x 1.74 respectively; where y refers to organ depth and x refers to patient separation in cm with a significant correlation at R2 = 0.8. The DD % for the tumor (cervix) ; Bladder; head of femur and the rectum were 89.6 %; 61.2; 50.2 % and 38.1 % respectively. The back scattered radiation increases as the tissue volume increases leading to increment of DD % and the back scatter factor increases exponentially with field size increment based on the following equation: y = 0.022lnx + 0.98; which is so significant at R2 = 0.7; where y refers to BSF and x refers to equivalent field size in cm.

Keywords: External radiation, cervix, cancer, toxicity, estimation

Edition: Volume 3 Issue 6, June 2014,

Pages: 1694 - 1698

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