DICOM PS3.18 2021b - Web Services

3 Definitions (Current)
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# 3 Definitions

For the purposes of this Part of DICOM, the following terms and 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 (AE)

  See [ISO 7498-1].

Real-World Activity

  See [ISO 7498-1].

## 3.2 DICOM Introduction and Overview Definitions

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

Service-Object Pair Class (SOP Class)

  Service-Object Pair Class (SOP Class).

## 3.3 DICOM Message Exchange

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).

## 3.4 DICOM Information Object Definitions

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

Multi-frame Image

  Multi-frame Image.

## 3.5 DICOM Conformance

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

Conformance Statement

  Conformance Statement.

## 3.6 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 Element Tag

  Data Element Tag.

Data Set

  Data Set.

Sequence of Items

  Sequence of Items.

Unique Identifier (UID)

  Service-Object Pair Class (SOP Class).

## 3.7 DICOM Service Class Definitions

This Part of the Standard makes use of the following terms defined in PS3.4:

Service-Object Pair Instance (SOP Instance)

  Service-Object Pair Instance (SOP Instance).

## 3.8 HyperText Transfer Protocol (HTTP/HTTPS) Definitions

This Part of the Standard makes use of the following terms defined in [RFC7230] Section 2.1 Client/Server Messaging:

HTTP

  See [RFC7230].

HTTPS

  See [RFC7230].

origin server

  See [RFC7230].

user agent

  See [RFC7230].

## 3.9 Web Services Definitions:

Bulk Data

  An object that contains an octet-stream containing one or more Value Fields (typically containing large data, such as Pixel Data) extracted from a DICOM Dataset. See Metadata.

  ### Note

  1. The octet-stream does not include the Attribute Tag, Value Representation, or Attribute Length.

  2. For the value of a frame of a Pixel Data Attribute encoded in a compressed Transfer Syntax, it does not include the Basic Offset Table and Data Stream Fragment Item tags and lengths.

Bulk Data URI

  A Uniform Resource Identifier that references Bulkdata.

DICOM Object

  An instance of a data object as defined by PS3.3 that has been allocated an unique identifier in the format specified for SOP Instance UID in PS3.3 and has been chosen as an object to be saved securely for some period of time. Within the DICOM Standard, a DICOM Object is typically a Composite Service Object Pair (SOP) Instance.

DICOM Resource

  One or more DICOM Objects that are referenced by a URL.

DIMSE Proxy

  An origin server that responds to DICOM Web Service requests by executing DIMSE transactions to a backend server.

Event Report

  A Dataset containing elements describing an event that occurred on the origin server. See Section 11.12.

Metadata

  A DICOM Dataset where zero or more elements (typically containing large data, such as Pixel Data) have been replaced with Bulkdata URIs.

RESTful Web Service

  A web service is RESTful if it is implemented using the REST architecture and principles. See https://en.wikipedia.org/wiki/Representational_state_transfer.

Service

  When used in this Part of the Standard the term Service means a set of transactions and resources to which those transactions apply.

sRGB

  A standard RGB color space defined in [IEC 61966-2.1].

Status Report

  A Status Report is information contained in a response payload describing warnings or errors related to a request.

Subscriber

  The creator or owner of a Subscription, typically a user agent.

Target URI

  The URI contained in a request message. It designates the resource that is the target of the request.

Thumbnail

  A single frame image that is representative of the content of a DICOM Study, Series, Instance, or Frame. It is encoded in a Rendered Media Type. See Section 8.7.4 and Section 10.4.4.

Transaction

  When used in this Part of the Standard the term Transaction means an HTTP/HTTPS request/response message pair.

UTF-8

  Unicode UTF-8 character set defined in [ISO/IEC 10646].

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DICOM PS3.18 2021b - Web Services