X-ray Markers; anatomical side markers, Pb markers, lead markers, x-ray lead markers or radiographic film identification markers; are used to mark x-ray films, both in hospitals and in industrial workplaces. They are used on radiographic images to determine the anatomical side of the body, date of the procedure and may include patients name.
Most X-ray markers consist of a right and a left letter with the radiographer's initials. Markers are also used to indicate positioning of the body e.g. supine, or the time when performing a procedure.