A scanner for processing intra-oral flexible information carrier plate exposed to X-rays and an envelope for the plate. The scanner comprises housing with an opening for entering an enveloped plate. The envelope is provided with a protrusion and the opening of the scanner is provided with a shoulder. When the enveloped plate is entered in the opening the protrusion abuts the shoulder such that the plate is allowed to exit from the envelope and pass inside the housing while the envelope is retained outside the housing.
