1. A method for generating computed-tomography image, comprising: exposing an object with x-rays at a plurality of scans at a position of said object to obtain projection data at a plurality of views; generating first images serially in time using the projection data; generating second images by smoothing respective pluralities of said first images; generating a gradient image based on at least one of said first images; and generating a display image by weight blending one said of first images and one of said second images using said gradient image.