UIDs
UIDs are fundamental to DICOM and have many uses, including there being a unique one for each SOP Class and for each Composite Instance and each Normalised Instance. There are several rules to be followed when making UIDs, and this page is a useful summary General DICOM Rules Total length must be 1- 64 characters, including the stops Must contain only digits 0-9 and full stops Each numeric “component” (between stops) must be a valid and unambiguous integer number, and so must not have a leading zero (unless the whole component is zero), 1.
