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X-ray is the oldest medical imaging modality. In spite of its age and relative simplicity, x-ray will continue to be used for the foreseeable future. A C-arm system, like the one shown in the image to the right, is often used during surgery for image-guided surgery. X-ray is relatively cheap and fast. The primary disadvantage is x-ray exposure. Those in the operating room are required to wear lead shields. Imaging quality can also be relatively poor with mobile systems.