Web Access to DICOM Objects. Part 18 of the DICOM standard details an interface to DICOM Objects using HTTP. WADO enables, for example, retrieving DICOM images as JPEG  using an HTTP GET request. The importance and acceptance of WADO increased dramatically together with the internet revolution and increasing use of cloud services and PACS [...]


Value Representation. The DICOM Data Type. VR’s are named as two letter codes. E.g. UI is the UID. PN is Person Name.


Value Multiplicity. A DICOM Element may have multiple values. String values are separated by \ while the VM of binary values is determined by dividing the element length in bytes by the size of one value. For example the VM of a data element of type US (Unsigned Short) that has a length of 6 [...]


Acronym for “Unique  Identifier”. UID’s are widely used in DICOM and are assigned to objects, classes, transfer syntaxes, special services, and specific data elements. NEMA registers DICOM UID’s and every instance of a DICOM application should have a UID prefix that it can use to generate new UID’s from.

Transfer Syntax

Defines how data elements are serialized in three (3) aspects: (1) Byte order (Little/Big endian) (2) Explicit or Implicit Value Representation and (3) If and what type of compression is used for the image pixel data element. Represented as a pre-defined UID. Transfer syntax is negotiated for every service in the association setup phase and [...]

SCM – Storage Commitment Management

A DICOM Service that is used to “pass the ownership” on DICOM Instances from one application to another. It confirms that a DICOM Application stores a set of DICOM Instances in a similar way to the “commit” SQL command. When receiving successful commit result, an application can assume that the instances are safely stored by [...]

SOP Instance UID

Uniquely identifies one DICOM Instance. Every DICOM Instance has a UID.

Service Object Pair (SOP) Class

A pair of an IOD and DIMSE Service that together defines a capability of a DICOM AE. At association phase, AE’s exchange SOP Class UID’s and agree on their capabilities.


Picture Archive and Communication System. It is commonly accepted that PACS provides its services using the DICOM Network Protocol. PACS is an information technology system that provides services for archiving and restoring medical imaging documents using the DICOM network protocol standard. A common PACS provides the following services: Storage - Allows imaging modalities to store the [...]

MWL – Modality Worklist Management

A DICOM Service that is used for managing “tasks” for Imaging Modalities.