1. A method for combining images acquired using helical half-scan imaging, comprising: identifying an image plane within an overlap region comprising data from first and second view streams representative of first and second cycles of acquired image data, the image plane comprising the same anatomical structure; calculating first and second weighting functions for first and second images based on first and second tube positions of an x-ray tube, the first and second images corresponding to the image plane and being from the first and second view streams, respectively, the first and second tube positions corresponding to the image plane; and forming a weighted image based on the first and second weighting functions and the first and second images.