1. A method for aligning a digital x-ray imaging system comprising an x-ray source, an antiscatter grid, and a detector, the grid being attached to the detector and disposed between the detector and an object under study, the grid having a front side and a back side and at least one pair of substantially x-ray opaque alignment bars, one bar of said pair attached to the front side and the other bar of said pair attached to the back side, the method comprising the steps of: (a) taking a low exposure non-diagnostic x-ray image of the object with a dose sufficient to create an image of the alignment bars on the object; (b) measuring the relative position on the image of the alignment bars; (c) adjusting the relative angle of the detector to the x-ray source to bring the grid into alignment with the x-ray source; and (d) taking a diagnostic x-ray exposure image of the object.