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The X-rays produced in the head exit from the tube via an opening in the casing - this forms the primary beam which is directed at the area of interest in the patient. X-rays which are oriented away from this opening are absorbed by the lead casing which surrounds the tube.
 
The X-rays produced in the head exit from the tube via an opening in the casing - this forms the primary beam which is directed at the area of interest in the patient. X-rays which are oriented away from this opening are absorbed by the lead casing which surrounds the tube.
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Also see [[Contrast Radiography]]
     
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