Planning Optimization of Conformal Radiotherapy Techniques for Meningioma Brain Tumors
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- Category: Vol. 80, June 2012
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Planning Optimization of Conformal Radiotherapy Techniques for Meningioma Brain Tumors,AIDA SALAMA, SAHAR AWAD, TAMER DAWOD, ALIA AZAM
Abstract
In modern radiotherapy (RT) techniques (conformal), the optimum dose distribution can be achieved by covering the target volume with certain isodose line (e.g. 95%), aiming to cover this volume with the clinical prescribed dose. Recent linear accelerators are provided with multileaf collimators (MLCs) to configure the shape of the radiation field with the treated volume in any direction. To gain the same results in conventional radiotherapy, tedious work is necessary in mould room to make the required shielding blocks. The aim of this study is to evaluate the conformal radiotherapy techniques with different field arrangements in comparison with the conventional field arrangement in order to deliver a higher dose to the target volume than conventionally given, in other words to rise the dose, while sparing surround healthy tissues. A three dimensional treatment planning system (3D-TPS) will be used for dose calculations and data analysis to choose the optimal dose distributions. In order to deliver a high conformal dose distribution, multileaf collimators and accurate patient/ phantom positioning is essential.