DICOM PS3.4 2021c - Service Class Specifications

3 Definitions (Current)
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# 3 Definitions

For the purposes of this Standard the following definitions apply.

## 3.1 Reference Model Definitions

This Part of the Standard makes use of the following terms defined in [ISO 7498-1]:

Application Entity

  See [ISO 7498-1].

Service

  See [ISO 7498-1].

Application Entity Title (AET)

  See [ISO 7498-1].

## 3.2 Service Conventions Definitions

This Part of the Standard makes use of the following terms defined in [ISO/TR 8509]:

Primitive

  See [ISO/TR 8509].

## 3.3 DICOM Introduction and Overview Definitions

This Part of the Standard makes use of the following terms defined in PS3.1:

Attribute

  Attribute.

Command

  Command.

Data Dictionary

  Data Dictionary.

Information Object

  Information Object.

Message

  Message.

Service-Object Pair Class (SOP Class)

  Service-Object Pair Class (SOP Class).

## 3.4 DICOM Upper Layer Service Definitions

This Part of the Standard makes use of the following terms defined in PS3.8:

DICOM Upper Layer Service

  DICOM Upper Layer Service.

## 3.5 DICOM Message Exchange Definitions

This Part of the Standard makes use of the following terms defined in PS3.7:

DICOM Message Service Element (DIMSE)

  DICOM Message Service Element (DIMSE).

DIMSE-N Services

  DIMSE-N Services.

DIMSE-C Services

  DIMSE-C Services.

DIMSE Service Group (DSG)

  DIMSE Service Group (DSG).

## 3.6 DICOM Information Object Definitions

This Part of the Standard makes use of the following terms defined in PS3.3:

Attribute Tag

  AttributeTag.

Composite IOD

  Composite IOD.

DICOM Application Model

  DICOM Application Model.

DICOM Information Model

  DICOM Information Model.

Information Object Definition (IOD)

  Information Object Definition.

Module

  Module.

Normalized IOD

  Normalized IOD.

Functional Group

  Functional Group.

## 3.7 DICOM Conformance

This Part of the Standard makes use of the following terms defined in PS3.2:

Conformance Statement

  Conformance Statement.

Standard SOP Class

  Standard SOP Class.

Specialized SOP Class

  Specialized SOP Class.

Standard Extended SOP Class

  Standard Extended SOP Class.

Private SOP Class

  Private SOP Class.

Standard Attribute

  Standard Attribute.

Private Attribute

  Private Attribute.

## 3.8 DICOM Data Structures and Encoding

This Part of the Standard makes use of the following terms defined in PS3.5:

Data Element

  Data Element.

Data Set

  Data Set.

Unique Identifier (UID)

  Unique Identifier (UID).

## 3.9 DICOM Service Class Definitions

The following definitions are commonly used in this Part of the DICOM Standard:

Classic Image Storage SOP Class

  An Image Storage SOP Class that is defined by an IOD that stores a single frame and defines the majority of the Attributes in the top-level Data Set.

Combined Print Image

  A pixel matrix created by superimposing an image and an overlay, the size of which is defined by the smallest rectangle enclosing the superimposed image and overlay.

Enhanced Image Storage SOP Class

  An Image Storage SOP Class that is defined by an IOD that stores multiple frames and defines the majority of the Attributes in Functional Group Sequences.

Legacy Converted Enhanced Image Storage SOP Class

  A modality-specific Enhanced Image Storage SOP Class that is defined by an IOD that defines only generic Functional Group Sequences, which does not require information that is not present in Classic Image Storage SOP Class Instances, and is intended for storage of converted Classic Image Storage SOP Class Instances when there is insufficient information to use a True Enhanced Image Storage SOP Class.

Meta Service-Object Pair Class (Meta SOP Class)

  A pre-defined set of SOP Classes that may be associated under a single SOP for the purpose of negotiating the use of the set with a single item.

Performed Procedure Step SOP Class

  Any SOP Class that encodes the details about the performance of a procedure step.

Performed Procedure Step SOP Instance

  An instance of a Performed Procedure Step SOP Class. Note that all UPS instances are instances of the UPS Push SOP Class, which is capable of encoding details about the performance of a procedure step (in addition to details about the scheduled procedure step) and thus qualify as an instance of a Performed Procedure Step SOP Class.

Preformatted Grayscale Image

  An image where all annotation, graphics, and grayscale transformations (up to and including the VOI LUT) expected in the printed image have been burnt in or applied before being sent to the SCP. It is a displayable image where the polarity of the intended display is specified by Photometric Interpretation (0028,0004).

Preformatted Color Image

  An image where all annotation, graphics, and color transformations expected in the printed image have been burnt in or applied before being sent to the SCP.

Real-World Activity

  That which exists in the real world that pertains to specific area of information processing within the area of interest of the DICOM Standard. Such a Real-World Activity may be represented by one or more computer information metaphors called SOP Classes.

Real-World Object

  That which exists in the real world upon which operations may be performed that are within the area of interest of the DICOM Standard. Such a Real-World Object may be represented through a computer information metaphor called a SOP Instance.

Related General SOP Class

  A SOP Class that is related to another SOP Class as being more generalized in terms of behavior defined in the Standard, and that may be used to identically encode an instance with the same Attributes and values, other than the SOP Class UID. In particular, this may be the SOP Class from which a Specialized SOP Class (see PS3.2) is derived.

Service Class User (SCU)

  The role played by a DICOM Application Entity (DIMSE-Service-User) that invokes operations and performs notifications on a specific Association.

Service Class Provider (SCP)

  The role played by a DICOM Application Entity (DIMSE-Service-User) that performs operations and invokes notifications on a specific Association.

Service Class

  A collection of SOP Classes and/or Meta SOP Classes that are related in that they are described together to accomplish a single application.

Service-Object Pair Instance (SOP Instance)

  A concrete occurrence of an Information Object that is managed by a DICOM Application Entity and may be operated upon in a communication context defined by a specific set of DIMSE Services (on a network or interchange media). A SOP Instance is persistent beyond the context of its communication.

True Enhanced Image Storage SOP Class

  A modality-specific Enhanced Image Storage SOP Class that is defined by an IOD that defines modality-specific Functional Group Sequences, Attributes and sets of values, and is intended for creation by acquisition devices.

## 3.10 Device Independent Pixel Values

This Part of the Standard makes use of the following terms defined in PS3.3:

P-Value

  P-Value.

Profile Connection Space Value (PCS-Value)

  Profile Connection Space Value (PCS-Value).

## 3.11 HTTP Definitions

This Part of the Standard makes use of the following terms defined in [RFC7230]:

Origin-Server

  See [RFC7230].

User-Agent

  See [RFC7230].

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DICOM PS3.4 2021c - Service Class Specifications