1. A system, comprising a computer including a processor and a memory, the memory storing instructions executable by the processor such that the computer is programmed to: receive a set of first images, each of the first images including respective exposures of an image capture device to a beam of radiation, each of a plurality of components of a radiation delivery system being at respective specified orientations with respect to a three-dimensional coordinate system during each of the exposures; reconstruct respective beam images from each of the exposures by drawing a line at a predetermined angle to the first image and through a center of a radiation beam shown on each first image; and combine the reconstructed beam images on a second image.