Transfer Syntax is the language used in DICOM to describe the DICOM file format and the network transfer methods. 3 main variables are contained in the Transfer Syntax: VR: Implicit/Explicit Endianism: Little-Endian/BigEndian Pixel Data Compression For DICOM Files, the Transfer Syntax is stored in the File Meta Header, and for networking it is negotiated between the SCU & SCP. For more information about how the negotiation happens and how to control the network transfer using Transfer Syntax can be found here.

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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.

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WADO is a protocol (defined in DICOM Part 18) for retrieving DICOM Composite Instances using the http or https protocols. It is simple to write a WADO server using DicomObjects - see the Example on the web

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The Well-Known UIDs are Static Instance UID mostly used in normalised operations. The following is a list of all UIDs in DICOM

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