1. A method for computerized detection of lung nodules in CT section images, comprising the following steps: warping a first CT section image to match a second CT section image; warping a third CT section image to match the second CT section image; creating a mask image by linear interpolation of the warped first CT section image and the warped third CT section image; subtracting the mask image from the second CT section image to from a subtraction image; and detecting small lung nodules based on the subtraction image.