1. A method for reconstruction of images, which methods provide a mechanism for compensating for motion of an object being imaged; said method comprising the steps of: acquiring projection data of the object being imaged using a scanning apparatus; selecting an image reconstruction methodology that is appropriate for one of expected motion, severity or complexity of the motion of the object being imaged and efficient processing of projection data; providing an estimation of the object's motion, including estimating a motion vector field for the object being imaged; and executing the image reconstruction methodology using the motion vector field and the acquired projection data, so as to provide a re-constructed image.