The table can be moved both up and down; many tables have "floating" table tops meaning the top of the table can be moved in any horizontal direction. There is also a "chest bucky", the vertical x-ray receptor used for chest x-rays or other vertical x-rays.
Some procedures may require more than one or two x-rays such as studies of the gastrointestinal tract or placement of PICC lines, therefore, doctors will often use flouroscopy. According to Wikipedia, "Fluoroscopy is an imaging technique commonly used by physicians to obtain real-time moving images of the internal structures of a patient through the use of a fluoroscope. In its simplest form, a fluoroscope consists of an x-ray source and fluorescent screen between which a patient is placed. However, modern fluoroscopes couple the screen to an x-ray image intensifier and CCD video camera allowing the images to be recorded and played on a monitor."
During surgery it may be necessary for the doctor to see a live image of what they are doing or where they are working inside a patient, this is possible with a c-arm (much like fluoroscopy but mobile).
With a c-arm doctors are able to use a constant stream of x-rays to see live x-ray images.
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