1. A system for processing an image, comprising a region detector comprising an artifact detector for detecting a region comprising an artifact in the image; a parameter determining unit for determining a parameter, based on a portion of the image excluding the detected region, wherein the parameter determining unit is operatively coupled to the region detector to receive a representation of the region comprising the artifact; an image processing module for processing the image, using the derived parameter; and a user interface to enable a user to visualize both the image and the artifact excluded during the processing of the image.