General-DICOM

UID Truncated

Why has the UID has been truncated?

There is a 64-character limit for UIDs in DICOM Standard. the trailing digits are simply truncated.

Structured Reporting

Service Class User

SCU is an acronym for "Service Class User" which is the weird DICOM term for a client application. All DICOM network communications occur between an SCU and a Service Class Provider (SCP)

Presentation Context

A Presentation Context may be considered as a negotiated "sub-channel" with a DICOM Association through which the Application_Entities have agreed to exchange information.

A proposed presentation context consists of

Performed Procedure Step Object

This is a Normalised_Instance which represents the state of a procedure step, and is:

  • Created by the SCU using N-CREATE with a status of "IN PROGESS"
  • Updated as necessary by the SCU using N-SET operations

The final status must (updated by the N-SET) must be "COMPLETED" or "DISCONTINUED"

Integrating the Healthcare Enterprise

Integrating the Healthcare Enterprise (IHE) is an International collaboration, with the aim of improving the quality of IT integration in healthcare. DICOM and HL7 are the main protocols used.

For more information see the IHE Web site

Storage Commitment

Well-known UIDs

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

  • Instance_StorageCommitmentPush 1.2.840.10008.1.20.1.1
  • Instance_StorageCommitmentPull 1.2.840.10008.1.20.2.1
  • Instance_Printer 1.2.840.10008.5.1.1.17
  • Instance_PrinterConfigurationRetrieval 1.2.840.10008.5.1.1.17.376
  • Instance_PrintQueue 1.2.840.10008.5.1.1.25

Actually only Instance_StorageCommitmentPush and Instance_Printer are commonly used.

Instance UID

Every object in DICOM, whether a permanent Composite_Object or merely a transient Normalised_Object as used in Printing has a unique UID called its Instance UID. This is different from the SOP_class UID which is shared with all other objects of the same type.

Application Entity

An Application Entity (AE) is the name used in DICOM to represent a system or program running on a system which is the end-point of DICOM communications.

Each Application Entity has an Application Entity Title (AET) which only needs to be locally unique, but cannot exceed 16 characters.

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