There is disclosed a method apparatus for image processing of e.g. MRI images. A method and apparatus is disclosed enabling one to determine if an image contrast/intensity change of a chosen point within an imaged subject volume (e.g. a lesion) is an artefact of motion in the imaged subject. An apparatus and method for fast visual assessment of the imaged subject volume's alignment quality (within a time-sequence of images) is provided, and an interactive display tool enabling effective use of this method is provided.