I am just starting as PACS admin but on our Vivid & Philips US (I am cardio/vascular/cath lab PACS), we can choose whether or not to have the images contain the patient data, which we do not.  It is a selection on the modality.  The only place patient data lives is in the dicom header and that I am sorry to say happens often here as there has not been a lot of push in the past to make sure the tech is pulling the right one from the worklist.  Trying to clean that up, will try the DICOMPROXY software, might help.