1. A method for detection of nodules in a medical image, the method comprising: (a) receiving image data representing a medical image; (b) selecting a region of interest in the medical image; (c) copying image data contained within the region of interest; (d) displaying an image containing a plurality of copies of the image data contained in the region of interest; (e) moving the region of interest with respect to the medical image and repeating steps (b)-(d).