DICOM PS3.3 2020a - Information Object Definitions |
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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 is based on the concepts developed in [ISO 7498-1] and [ISO 7498-2] and makes use of the following terms defined in them:
Application Entity (AE) |
See [ISO 7498-1]. |
Service |
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. |
Message |
Message. |
Service-Object Pair Class (SOP |
Service-Object Pair Class (SOP Class). |
Class) |
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3.4 DICOM Service Class Specifications
This Part of the Standard makes use of the following terms defined in PS3.4:
Real-World Activity |
Real-World Activity. |
Real-World Object |
Real-World Object. |
Service Class |
Service Class. |
Service Class User (SCU) |
Service Class User (SCU). |
Service Class Provider (SCP) |
Service Class Provider (SCP). |
Service-Object Pair Instance |
Service-Object Pair Instance (SOP Instance). |
(SOP Instance) |
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Preformatted Grayscale Image |
Preformatted Grayscale Image. |
Preformatted Color Image |
Preformatted Color Image. |
Related General SOP Class |
Related General SOP Class. |
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3.5 DICOM Data Structures and Encoding
This Part of the Standard makes use of the following terms defined in PS3.5:
Basic Offset Table (BOT) |
Basic Offset Table (BOT). |
Data Element |
Data Element. |
Data Element Tag |
Data Element Tag. |
Data Element Type |
Data Element Type. |
Data Set |
Data Set. |
Defined Term |
Defined Term. |
Enumerated Value |
Enumerated Value. |
Extended Offset Table (EOT) |
Extended Offset Table (EOT). |
Sequence of Items |
Sequence of Items. |
Unique Identifier (UID) |
Service-Object Pair Class (SOP Class). |
3.6 DICOM Message Exchange
This Part of the Standard makes use of the following terms defined in PS3.7:
DICOM Message Service |
DICOM Message Service Element (DIMSE). |
Element (DIMSE) |
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DIMSE-N Services |
DIMSE-N Services. |
DIMSE-C Services |
DIMSE-C Services. |
3.7 DICOM Upper Layer Service
This Part of the Standard makes use of the following terms defined in PS3.8:
DICOM Upper Layer Service |
DICOM Upper Layer Service. |
3.8 DICOM Information Object |
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Acquisition Context |
A description of the conditions present during data acquisition. |
Acquisition Protocol Element |
Asequentialcomponentofanacquisitionprotocol,thatcontainstheSCANNINGPARAMETERS |
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necessary to perform a single SCAN. In the case of CT this would correspond to tube voltage, |
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tube current, rotation time, spatial location, etc. and an Acquisition Protocol Element also |
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corresponds to an XR-25 PROTOCOL ELEMENT. |
Assertion |
An affirmative statement or declaration by a specified entity about a specified or implied subject |
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for a specified or implied purpose. |
Attribute Tag |
A unique identifier for an Attribute of an Information Object composed of an ordered pair of |
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numbers (a Group Number followed by an Element number). |
Basic Directory IOD |
The Basic Directory Information Object Definition is an abstraction of the information to identify |
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a File-set and facilitate access to the information stored in the files of a File-set based on key |
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medical information. |
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Basic Directory Information |
A model that defines the relationship between the various types of Directory Records that may |
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Model |
be used in constructing DICOM Directories. |
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Cine Run |
A set of temporally related frames acquired at constant or variable frame rates. This term |
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incorporates the general class of serialography. |
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Note |
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A Cine Run is typically encoded as a multi-frame image. |
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Code Sequence Attribute |
Attribute that (usually) includes the string "Code Sequence" in the Attribute Name and has a VR |
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of SQ (Sequence of Items). Its purpose is to encode concepts using code values and optional |
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text meanings from coding schemes. Section 8.1 through Section 8.8 specify the Attributes of |
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which the Sequence Items (Attribute Sets) of Code Sequence Attributes are constructed. |
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Composite IOD |
AnInformationObjectDefinitionthatrepresentspartsofseveralentitiesintheDICOMApplication |
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Model. Such an IOD includes Attributes that are not inherent in the Real-World Object that the |
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IOD represents but rather are inherent in related Real-World Objects. |
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Derived Image |
An image in which the pixel data was constructed from pixel data of one or more other images |
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(source images). |
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DICOM Application Model |
AnEntity-RelationshipdiagramusedtomodeltherelationshipsbetweenReal-WorldObjectsthat |
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are within the area of interest of the DICOM Standard. |
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DICOM Information Model |
An Entity-Relationship diagram that is used to model the relationships between the Information |
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ObjectDefinitionsrepresentingclassesofReal-WorldObjectsdefinedbytheDICOMApplication |
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Model. |
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Functional Group |
A set of logically related Attributes that are likely to vary together. May be used in Multi-frame |
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IODs to describe parameters that change on a per frame basis. |
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Information Entity |
That portion of information defined by a Composite IOD that is related to one specific class of |
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Real-World Object. There is a one-to-one correspondence between Information Entities and |
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entities in the DICOM Application Model. |
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Information Object Definition |
A data abstraction of a class of similar Real-World Objects that defines the nature and Attributes |
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(IOD) |
relevant to the class of Real-World Objects represented. |
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Module |
A set of Attributes within an Information Entity or Normalized IOD that are logically related to |
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each other. |
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Multi-frame Image |
Image that contains multiple two-dimensional pixel planes. |
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Normalized IOD |
An Information Object Definition that represents a single entity in the DICOM Application Model. |
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Such an IOD includes Attributes that are only inherent in the Real-World Object that the IOD |
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represents. |
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Protocol Element |
A sequential component of a protocol, consisting of all the parameters necessary to perform that |
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component of the protocol. |
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ReconstructionProtocolElement |
A sequential component of a reconstruction protocol, such as generating CT thin images or |
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multiplanar reformats. |
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Specialization |
Specialization is the replacement of the Type, value range and/or description of an Attribute in a |
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generalModuleofanIOD,byitsType,valuerangeand/ordescriptiondefinedinamodality-specific |
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Module of an IOD. |
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Note
ThesameAttributemaybepresentinmultipleModulesinthesameIODbutnotspecified to be "Specialized".
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DICOM PS3.3 2020a - Information Object Definitions |
StorageProtocolElement |
A sequential component of a storage protocol, such as sending a Series of images to a PACS |
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or an archive or a processing workstation. |
3.9 Character Handling Definitions
This Part of the standard makes use of the following terms defined in [ISO/IEC 2022]:
Coded Character Set |
See [ISO/IEC 2022]. |
Code Extension |
See [ISO/IEC 2022]. |
Escape Sequence |
See [ISO/IEC 2022]. |
3.10 Radiotherapy
This Part of the Standard is based on the concepts developed in [IEC 61217] and makes use of the following terms defined in it:
FIXED REFERENCE System |
See [IEC 61217]. |
GANTRY System |
See [IEC 61217]. |
BEAM LIMITING DEVICE |
See [IEC 61217]. |
System |
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WEDGE FILTER system |
See [IEC 61217]. |
X-RAY IMAGE RECEPTOR |
See [IEC 61217]. |
System |
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PATIENT SUPPORT System |
See [IEC 61217]. |
TABLE TOP ECCENTRIC |
See [IEC 61217]. |
System |
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TABLE TOP System |
See [IEC 61217]. |
3.11 Macros |
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Attribute Macro |
A set of Attributes that are described in a single table that is referenced by multiple Module or |
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other tables. |
3.12 Device Independent Pixel Values
This Part of the Standard makes use of the following terms defined in PS3.14:
P-Value |
P-Value. |
Profile Connection Space Value |
Adeviceindependentcolorvaluethatiscreatedbytheapplicationofthetransformationspecified |
(PCS-Value) |
in an ICC profile. |
3.13 Codes and Controlled Terminology Definitions
This Part of the Standard makes use of the following terms defined in PS3.16:
Baseline Context Group |
Baseline Context Group Identifier (BCID). |
Identifier (BCID) |
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DefinedContextGroupIdentifier |
Defined Context Group Identifier (DCID). |
(DCID) |
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Context Group |
Context Group. |
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Context Group Version |
Context Group Version. |
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Context ID (CID) |
Context ID (CID). |
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Mapping Resource |
Mapping Resource. |
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Relationship Type |
Relationship Type. |
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DICOM Content Mapping |
DICOM Content Mapping Resource (DCMR). |
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Resource (DCMR) |
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Template |
Template. |
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Template ID (TID) |
Template ID (TID). |
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Value Set |
Value Set. |
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Baseline Template Identifier |
Baseline Template Identifier (BTID). |
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(BTID) |
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Defined Template Identifier |
Defined Template Identifier (DTID). |
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(DTID) |
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Coding Scheme |
Coding Scheme. |
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3.14 Reference Model Security Architecture Definitions |
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This Part of the Standard makes use of the following terms defined in [ISO 7498-2]: |
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Digital Signature |
The definition is "Data appended to, or a cryptographic transformation of, a data unit that allows |
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arecipientofthedataunittoprovethesourceandintegrityofthatunitandprotectagainstforgery |
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e.g., by the recipient." |
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Data Confidentiality |
The definition is "the property that information is not made available or disclosed to unauthorized |
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individuals, entities or processes." |
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Data Origin Authentication |
The definition is "the corroboration that the source of data received is as claimed." |
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Data Integrity |
The definition is "the property that data has not been altered or destroyed in an unauthorized |
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manner." |
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Key Management |
The definition is "the generation, storage, distribution, deletion, archiving and application of keys |
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in accordance with a security policy." |
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3.15 Security Definitions |
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This Part of the Standard makes use of the following terms defined in [ECMA 235]: |
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Security Context |
The definition is "security information that represents, or will represent a Security Association to |
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an initiator or acceptor that has formed, or is attempting to form such an association." |
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3.16 DICOM Security Profiles |
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This Part of the Standard makes use of the following terms defined in PS3.15: |
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Message Authentication Code |
Message Authentication Code. |
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(MAC) |
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Certificate |
Certificate. |
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