1. A cone-beam computed tomography system comprising: an x-ray source that emits an x-ray beam; a slot that intercepts said x-ray beam so that a plurality of fan-shaped x-ray beams emanate from said slot towards an object; a detector receiving fan-shaped x-rays after said fan-shaped x-ray beams pass through said object, said detector generating an imaging signal for each of said received fan-shaped x-rays; and a computer connected to said detector so as to receive said imaging signals for each of said received fan-shaped x-rays, wherein said x-ray source, said slot and said detector move relative to said object so that multiple imaging signals are reconstructed by said computer to generate a three-dimensional cone-beam computed tomography image therefrom; and a display connected to said computer and displaying said three-dimensional cone-beam computed tomography image; and wherein said slot moves relative to said x-ray source.