الفهرس 
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Abstract
Tumor tissues are widespread disease that may spread to other neighboring organs. For treating tumorous tissues and preventing them from spreading, ablation techniques are applied. Such techniques include the radio frequency (RF), and microwave (MW) ablation. In this thesis, a three-dimensional finite element method (3D-FEM) model was designed to study the RF ablation effect on the tumor and the nearby tissues. Injured typically, the RF needle consists of three main parts, namely trocar tip, trocar base, and a number of electrodes. Consequently, the effect of number of electrodes, and their revolution angle (RA) on the injured tissues was studied. Moreover, several external required parameters were considered, including the ablation time, and the alternative voltage compatible with the needle specifications. The number of needle electrodes is changed from 2-12 electrodes, and their RA is changed from 60 180 . o The injured tissues in the different regions, whether in the healthy or tumor tissues are calculated at ( ) 1 t . The results illustrated that the ablated tumor tissues, and the injured healthy tissues increase with more number of the electrods or their revolution angle. Furthermore, the maximum required temperature for ablationdecreases with the increase in the number of electrodes or their RA. The results illustrated the main effect of the needle design on increasing the ablated tumor tissue and decreasing the maximum temperature.