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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)​

 

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)​

 

Preformatted Grayscale Image​

Preformatted Grayscale Image.​

Preformatted Color Image​

Preformatted Color Image.​

Related General SOP Class​

Related General SOP Class.​

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Page 92​ DICOM PS3.3 2020a - Information Object Definitions​

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)​

 

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​

Acquisition Context​

A description of the conditions present during data acquisition.​

Acquisition Protocol Element​

Asequentialcomponentofanacquisitionprotocol,thatcontainstheSCANNINGPARAMETERS​

 

necessary to perform a single SCAN. In the case of CT this would correspond to tube voltage,​

 

tube current, rotation time, spatial location, etc. and an Acquisition Protocol Element also​

 

corresponds to an XR-25 PROTOCOL ELEMENT.​

Assertion​

An affirmative statement or declaration by a specified entity about a specified or implied subject​

 

for a specified or implied purpose.​

Attribute Tag​

A unique identifier for an Attribute of an Information Object composed of an ordered pair of​

 

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​

 

a File-set and facilitate access to the information stored in the files of a File-set based on key​

 

medical information.​

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DICOM PS3.3 2020a - Information Object Definitions​

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Basic Directory Information​

A model that defines the relationship between the various types of Directory Records that may​

Model​

be used in constructing DICOM Directories.​

 

Cine Run​

A set of temporally related frames acquired at constant or variable frame rates. This term​

 

incorporates the general class of serialography.​

 

 

Note​

 

 

A Cine Run is typically encoded as a multi-frame image.​

 

Code Sequence Attribute​

Attribute that (usually) includes the string "Code Sequence" in the Attribute Name and has a VR​

 

of SQ (Sequence of Items). Its purpose is to encode concepts using code values and optional​

 

text meanings from coding schemes. Section 8.1 through Section 8.8 specify the Attributes of​

 

which the Sequence Items (Attribute Sets) of Code Sequence Attributes are constructed.​

Composite IOD​

AnInformationObjectDefinitionthatrepresentspartsofseveralentitiesintheDICOMApplication​

 

Model. Such an IOD includes Attributes that are not inherent in the Real-World Object that the​

 

IOD represents but rather are inherent in related Real-World Objects.​

 

Derived Image​

An image in which the pixel data was constructed from pixel data of one or more other images​

 

(source images).​

 

DICOM Application Model​

AnEntity-RelationshipdiagramusedtomodeltherelationshipsbetweenReal-WorldObjectsthat​

 

are within the area of interest of the DICOM Standard.​

 

DICOM Information Model​

An Entity-Relationship diagram that is used to model the relationships between the Information​

 

ObjectDefinitionsrepresentingclassesofReal-WorldObjectsdefinedbytheDICOMApplication​

 

Model.​

 

Functional Group​

A set of logically related Attributes that are likely to vary together. May be used in Multi-frame​

 

IODs to describe parameters that change on a per frame basis.​

 

Information Entity​

That portion of information defined by a Composite IOD that is related to one specific class of​

 

Real-World Object. There is a one-to-one correspondence between Information Entities and​

 

entities in the DICOM Application Model.​

 

Information Object Definition​

A data abstraction of a class of similar Real-World Objects that defines the nature and Attributes​

(IOD)​

relevant to the class of Real-World Objects represented.​

 

Module​

A set of Attributes within an Information Entity or Normalized IOD that are logically related to​

 

each other.​

 

Multi-frame Image​

Image that contains multiple two-dimensional pixel planes.​

 

Normalized IOD​

An Information Object Definition that represents a single entity in the DICOM Application Model.​

 

Such an IOD includes Attributes that are only inherent in the Real-World Object that the IOD​

 

represents.​

 

Protocol Element​

A sequential component of a protocol, consisting of all the parameters necessary to perform that​

 

component of the protocol.​

 

ReconstructionProtocolElement​

A sequential component of a reconstruction protocol, such as generating CT thin images or​

 

multiplanar reformats.​

 

Specialization​

Specialization is the replacement of the Type, value range and/or description of an Attribute in a​

 

generalModuleofanIOD,byitsType,valuerangeand/ordescriptiondefinedinamodality-specific​

 

Module of an IOD.​

 

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​

 

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​

 

WEDGE FILTER system​

See [IEC 61217].​

X-RAY IMAGE RECEPTOR​

See [IEC 61217].​

System​

 

PATIENT SUPPORT System​

See [IEC 61217].​

TABLE TOP ECCENTRIC​

See [IEC 61217].​

System​

 

TABLE TOP System​

See [IEC 61217].​

3.11 Macros​

 

Attribute Macro​

A set of Attributes that are described in a single table that is referenced by multiple Module or​

 

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)​

 

DefinedContextGroupIdentifier​

Defined Context Group Identifier (DCID).​

(DCID)​

 

Context Group​

Context Group.​

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DICOM PS3.3 2020a - Information Object Definitions​

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Context Group Version​

Context Group Version.​

 

Context ID (CID)​

Context ID (CID).​

 

Mapping Resource​

Mapping Resource.​

 

Relationship Type​

Relationship Type.​

 

DICOM Content Mapping​

DICOM Content Mapping Resource (DCMR).​

 

Resource (DCMR)​

 

 

Template​

Template.​

 

Template ID (TID)​

Template ID (TID).​

 

Value Set​

Value Set.​

 

Baseline Template Identifier​

Baseline Template Identifier (BTID).​

 

(BTID)​

 

 

Defined Template Identifier​

Defined Template Identifier (DTID).​

 

(DTID)​

 

 

Coding Scheme​

Coding Scheme.​

 

3.14 Reference Model Security Architecture Definitions​

 

This Part of the Standard makes use of the following terms defined in [ISO 7498-2]:​

 

Digital Signature​

The definition is "Data appended to, or a cryptographic transformation of, a data unit that allows​

 

arecipientofthedataunittoprovethesourceandintegrityofthatunitandprotectagainstforgery​

 

e.g., by the recipient."​

 

Data Confidentiality​

The definition is "the property that information is not made available or disclosed to unauthorized​

 

individuals, entities or processes."​

 

Data Origin Authentication​

The definition is "the corroboration that the source of data received is as claimed."​

 

Data Integrity​

The definition is "the property that data has not been altered or destroyed in an unauthorized​

 

manner."​

 

Key Management​

The definition is "the generation, storage, distribution, deletion, archiving and application of keys​

 

in accordance with a security policy."​

 

3.15 Security Definitions​

 

This Part of the Standard makes use of the following terms defined in [ECMA 235]:​

 

Security Context​

The definition is "security information that represents, or will represent a Security Association to​

 

an initiator or acceptor that has formed, or is attempting to form such an association."​

3.16 DICOM Security Profiles​

 

This Part of the Standard makes use of the following terms defined in PS3.15:​

 

Message Authentication Code​

Message Authentication Code.​

 

(MAC)​

 

 

Certificate​

Certificate.​

 

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