الفهرس 
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Abstract
Introduction : There is a significant increasing in patient numbers with metal implants, which can be close to, or within region which receive radiation therapy or radiology of CT. Metal implants result artifact in CT image. CT image is an important imaging method in radiology field for disease diagnosis and therapy planning. The present of unmovable metallic implants in the bodies of patients, usually produce a lot of streaking artifacts. Objective Metal artifact reduction is an important research for CT imaging to reduce artifacts and increase image quality The current study tries to evaluate one of methods for metal artifact reduction. Metal deletion technique is the applied method in using CT machine Subjects and Method There are 24 patient each of them has metal implants in different part in body. Taking Region Of Interest (ROI) = 0.20cm2 in low noise region and high noise region. ROI compared on the same slice before and after applying MAR. The normality of data first tested with Shapiro test. 16 patient of LSS vertebral fixation were used to calculate Contrast to noise ratio by using two laws. Statistic calculations made for resulted data using Statistical Package for the Social Sciences (SPSS) version 21. A profile for two images with and without MAR made by image j program.