The Ontology4DICOM (Ont4D) was developed for a DICOM image information object definition library, especialy for the DICOM image meta data curation. Ont4D was developed by using the ontology editor hozo. We have intended that Ont4D is mainly utilized for standardization of vendor-specific DICOM images in order to reduce inefficiency related to dicom data usage(such as DICOM image header morphing). Also, Ont4D data format is RDF/XML format which is defined by world wide web consorcium. This means that this ontology could applied by any data science research, such as open data, linked data, linked open data. Ont4D will become a key to enhance availability which related to DICOM header information in appropriate medical information systems.