TABLE 2.

Common catalog. A common catalog is required for querying the different databases accessible via the federated platform.

Common catalog	ArchiMed	CATI-DB	Shanoir	XNAT
study_name	study_code	Study.name	Study_Name	projectData.name
center_name	institution_name	Center.name	Center_Id	experimentData.acquisitionSite
manufacturer	manufacturer + manufacturer_model	unknown	Manufacturer_Name + Manufacturer_Model	imageSessionData.scanner
principal_investigator	study_investigator	Study.main_investigator	Investigator_Id	experimentData.investigator
subject_identifier	unknown in db, examCode used	Subject.code_in_study	Subject_Name	subjectData.ID
series_modality	file_type_acronym	Fileset.attribute.modality	Dataset_Ref_Dataset _Modality_Type_Id	imageScanData.modality
series_protocol	serie_desc	Fileset.attribute.sequence	Dataset_Name	imageScanData.series_description
series_creation_date	serie_date_time	Assessment.date	Dataset_Creation_Date	imageSessionData.date

The table above describes the structure of the common index and the mapping of each database into the common catalog.