Assessment of the Dose Coverage at the PTV for EBRT for Cervical Cancer Treatment Plan Using AAA Varian Eclipse TPS at Ocean Road Cancer Institute, Tanzania

Abstract

The implementation of the Eclipse treatment planning system software (Version 15.1) at Ocean Road Cancer Institute (ORCI), Tanzania has made the Anisotropic Analytical Algorithm (AAA) the necessary routine tool for dose calculations. However, the accuracy of the AAA algorithm in planning doses specifically for cervical cancer treatment is not well known. Therefore, this study investigated the accuracy of the AAA in dose calculation in terms of the dose coverage at the Plan Target Volume (PTV) for cervical cancer treatment at the ORCI. 50 treatment plans of adult patients with International Federation of Gynecology and Obstetrics (FIGO) stage IB-IIIB cervical cancer who underwent 3D-CRT were analyzed. The results show that most of the patients received at least 95% of the prescribed dose, averaging 48.3 Gy, which is about 96.6% of the prescription. The average maximum dose was about 53.7 Gy, equivalent to 107.4% of the prescribed dose. When compared to other studies, minor dosimetric differences, typically less than 2% for all the PTV dose parameters, were observed. In conclusion, the results affirm that the Eclipse AAA algorithm is sufficiently accurate for dose calculations for cervical cancer treatment planning at the ORCI.

Keywords:    AAA; Cervical cancer; FIGO; PTV; TPS