A chirally asymmetric marking on a sheet of radiographic film, positively identifies the side of the film sheet facing the front of an x-ray cassette during radiographic exposure. The marking is permanent and is accomplished automatically in an inexpensive, convenient and highly reliable manner....http://www.google.fr/patents/US5195122?utm_source=gb-gplus-shareBrevet US5195122 - Marker for exposure side of medical radiograph included with patient identification data
Marker for exposure side of medical radiograph included with patient ...
