When importing an external study in True PACS (CD import or reception of study from another hospital), PACS should propose a feature to automatically :
query a list of patients (for example DICOM MWL, PACS database, RIS / HIS, etc.)
identify potential patients matching the demographics of the imported study
have the user select the patient from the list
update the imported study's dicom header (patient id & demographics) according to the selected patient, and store the study into the PACS