www.ncbi.nlm.nih.gov/pmc/articles/PMC3592502/?report=reader

mpulse Noise Cancellation of Medical Images Using Wavelet Networks and Median Filters

Amir Reza Sadri, Maryam Zekri, [...], and Niloofar Gheissari

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Ultrasound imaging is widely used in medical diagnostic,unfortunately, the qualities of ultrasound images are generally limited due to the existence of speckle noises. As a result, edge-preserving noise reduction is an essential operation in ultrasound images processing.

Mostly it has Speckle Noise, so try noise reduction for that..i have attached a journal above which says few about impulse noise.

Thanks  a lot   for   all answers. 

Samsung, if you  don't  mind  can  show  me  this article  please. 

Thanks  in advance. 

Shaima. 

Sorry  Samsung,  I  did mistake  in spelling  of your  name. 

 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3592502/

please,this link maybe help you

Speckle is a granular 'noise' that inherently exists in and degrades the quality of the active radar, synthetic aperture radar (SAR), medical ultrasound and optical coherence tomography images.

The vast majority of surfaces, synthetic or natural, are extremely rough on the scale of the wavelength. Images obtained from these surfaces by coherent imaging systems such as laser, SAR, and ultrasound suffer from a common phenomenon called speckle. Speckle, in both cases, is primarily due to the interference of the returning wave at the transducer aperture. The origin of this noise is seen if we model our reflectivity function as an array of scatterers. Because of the finite resolution, at any time we are receiving from a distribution of scatterers within the resolution cell. These scattered signals add coherently; that is, they add constructively and destructively depending on the relative phases of each scattered waveform. Speckle noise results from these patterns of constructive and destructive interference shown as bright and dark dots in the image .

https://en.wikipedia.org/wiki/Speckle_noise

yes