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In contrast to the linear X-ray beam in a classical multidetector CT (MDCT) scanner, the cone-beam CT (CBCT) employs a cone-shaped radiation bundle that is detected by a flat panel detector. In this way, a 2-D image is obtained and only one single rotation around the patient is needed to render a full 3D dataset. From this dataset, reconstructions of 2D images in any chosen plane and at any slice thickness are possible. Theoretically, the maximal spatial resolution of a CBCT is 75 μm, but in practice today 150 µm is feasible, approximately 3.5–4 times higher than the current 500–625 µm resolution of MDCT.