A Survey on Magnetic Resonance Image Denoising Methods

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Magnetic Resonance Imaging (MRI) is one of the most effective medical imaging modality that have been used for soft tissue imaging, such as brain and muscles. Over the past several years, although the signal-to-noise ratio, resolution and acquisition speed of magnetic resonance imaging (MRI) technology have been increased, MR images are still affected by noise and artifacts. A trade-off between noise reduction and the preservation of actual detail features has to be made in such a manner that enhances the diagnostically relevant image content. Therefore, noise reduction is still a challenging task. In this paper different techniques have been presented for denoising MR images and each technique has its own advantages, assumptions and limitations.