518This chapter introduces the clinical radiographic units that the reader might find in the hospital. It takes a practical and descriptive approach to identifying clinical and radiographic units and their purpose. X-ray tubes have been described elsewhere in this book, the other essential equipment of the X-ray room is described here. This includes X-ray tables, C-arm tables, X-ray stands, grids, cassettes, AECs, patient positioning and protection devices, as well as mobile and portable equipment.